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Woolly lemur

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The woolly lemurs, also known as avahis or woolly indris, are nine species of strepsirrhine primates in the genus Avahi. Like all other lemurs, they live only on the island of Madagascar.

Woolly lemurs (Avahi)
Western woolly lemur (A. occidentalis)
Scientific classification Edit this classification
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Infraclass: Placentalia
Order: Primates
Suborder: Strepsirrhini
Family: Indriidae
Genus: Avahi
Jourdan, 1834[1]
Type species
Lemur laniger
Gmelin, 1788
Diversity
About 9 species
Combined distribution of Avahi[2]
Synonyms[1][3]
  • Microrhynchus Jourdan, 1834
  • Semnocebus Lesson, 1840
  • Iropocus Gloger, 1841
  • Habrocebus Wagner, 1839

The woolly lemurs are the smallest indriids with a body size of 30 to 50 cm (12 to 20 in) and a weight of 600 to 1,200 g (21 to 42 oz). Their fur is short and woolly.[4] The body can be grey-brown to reddish, with white on the back of the thighs,[5] with a long, orange tail. The head is round with a short muzzle and ears hidden in the fur.

Woolly lemurs can be found in humid and dry forests, spending most of their time in the leafy copse. Like many leafeaters, they need long naps to digest their food. Woolly lemurs live together in groups of two to five animals, often consisting of parents and several generations of their offspring.[6]

Like all indriids, the woolly lemurs are strictly herbivorous, eating predominantly leaves but also buds and, rarely, flowers.

Males and females live in pairs. Groups consisting of the mating pair and their offspring generally sleep together during the day in tree forks, vine tangles, and dense tree crowns.[7] Although likely, extrapair copulations (which exist in other pair-living nocturnal lemurs, e.g. the Masoala fork-marked lemur (Phaner furcifer)[8] and the fat-tailed dwarf lemur (Cheirogaleus medius)[9]) have not been demonstrated in Avahi species. The gestation period is four to five months, with births usually in September. In the first few months, the young rides on its mother's back. After about six months, it is weaned and can live independently after a year, although it will typically live in proximity to its mother for another year. Overall life expectancy is not known.

On November 11, 2005, a research team that discovered a new species of woolly lemur in 1990 in western Madagascar named the species Bemaraha woolly lemur (Avahi cleesei), after actor John Cleese, in recognition of Cleese's work to save lemurs in the wild.[10] In 2006, a taxonomic revision of eastern avahis based on genetic and morphological analyses led to the identification of two additional species: A. meridionalis and A. peyrierasi.[11] Further taxonomic revision increased the number of species by adding A. ramanantsoavanai and A. betsileo.[12] Finally, a new species was discovered in the Masoala peninsula, Moore's woolly lemur (A. mooreorum).[13]

Etymology

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In Malagasy, woolly lemurs are known as fotsifé, which means "white leg," in reference to the white patch of fur located dorsally on the thigh in all species.[14] In the east, woolly lemurs are known as avahy, which is an onomatopoeia derived from one of the animal's vocalizations.[14] Members of the eastern clade are also known by the Sabaki-derived name ampongy, which could be related to khima punju, a Swahili name for the Zanzibar red colobus (Colobus kirkii) on Unguja, or ndege, a generic name for birds. Another possible relation is with the Nyakyusa word for the kipunji (Rungwecebus kipunji). In the west, the western woolly lemur (Avahi occidentalis) is known as the tsarafangitra, which may be related to the Malagasy word for a curved mark or sign, fangitra.[15] The Bemaraha woolly lemur (Avahi cleesei) is called dadintsifaky, which means "grandfather of sifakas," on account of its resemblance to members of the genus.[10]

Evolutionary history

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The Indriidae and Lemuridae families diverged from the Cheirogaleidae and Lepilemuridae families together about 43 million years ago, and were separated from each other shortly thereafter.[16] Avahi split from the ancestor of Propithecus and Indri about 29 million years ago.[16][17] It is the most basal indriid on account of its early divergence, and because its karyotype closely resembles the most recent common ancestor of Indriidae, compared to extant sifakas and the indri.[18] The last common ancestor of all lemurs was hypothesized by Yves Rumpler et al. to have a somatic number of n = 66.[17] Extant western woolly lemurs have a somatic number of n = 70, wherein all but two autosomnal chromosomes are acrocentric. The X chromosome is submetacentric, and Y chromosome is acrocentric. The eastern woolly lemur differs from the western woolly lemur insofar as it underwent a Robertsonian translocation between der(14) and an ancestral lemuroid microchromosome resulting in chromosome 2, and a pericentric chromosomal inversion of the ancestral lemuroid chromosome 1, from which arose the eastern woolly lemur's chromosome 1.[18]

Molecular data indicate significant genetic variation among Peyrieras's woolly lemurs.[14]

Genetic variation exists within Peyrieras's woolly lemur, such that Rambinintsoa Andriantompohavana et al. identified two types of A. peyrierasi.[12] Runhua Lei et al. later found there to be three types, which were sympatric in forest fragments near Ranomafana National Park. Lei et al. assigned two of the types to a species complex that is shared with the Betsileo woolly lemur, with a third type potentially being a different species, though they suggested that larger data sets across different generations should be acquired before any conclusions could be drawn about the types' taxonomic relationships.[13] Further genetic variation within the genus was identified by Rumpler in a population of eastern woolly lemurs in Maromizaha Forest with a heterozygotic karyotype featuring an additional Robertsonian translocation. He speculated that this was the result of hybridization with a novel subspecies of A. laniger, or that the species exhibits intraspecific chromosomal polymorphism.[19] No species other than the eastern woolly lemur have since been described in Maromizaha Forest.[14]

Taxonomic classification

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Nine species are currently recognized.[20] The genus is divided into two clades that correspond with the western and eastern distributions of the species.[13]

Changes in taxonomy

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Sonnerat's maquis à bourres was the holotype of several synonymous descriptions.[21]

The earliest mention of a woolly lemur specimen was published in 1782 by Pierre Sonnerat in his memoir, Voyage aux Indes Orientales et a la Chine, wherein he details an eastern woolly lemur specimen that he named le maquis à bourres, which was acquired from the Antongil Bay area.[4][21] It was the only known woolly lemur specimen in Europe for almost 50 years.[22] Sonnerat's specimen may not have been the first recording of the animal; Henri Milne-Edwards and Alfred Grandidier believed that a vari de Manghabey that was mentioned by Étienne de Flacourt in 1661 was also a woolly lemur.[21] Sonnerat's maquis was not granted a binomial name until Johann Friedrich Gmelin published his 1788 description of the specimen as Lemur laniger in the posthumous 13th edition of Carl Linnaeus' Systema Naturae.[18] Using the maquis, Johann Heinrich Friedrich Link then wrote of a Lemur brunneus in 1795, based on Gmelin's description. Étienne Geoffroy Saint-Hilaire was the first to remove the woolly lemur from the Lemur genus, instead assigning it to Indri as Indri longicaudatus in 1796.[4] Johann Karl Wilhelm Illiger subsequently described it as Lichanotus laniger in 1811, with Lichanotus being an alternative generic name to Indri and Lemur. Later authors, such as Jan van der Hoeven and Daniel Giraud Elliot, would mistakenly bestow priority on Lichanotus over Avahi on account of the former preceding the latter. This nomenclature was invalid, as Illiger's Lichanotus was coined to replace the generic name Indri, rather than to move the woolly lemur to a unique genus.[18] The first author to validly describe the woolly lemur as a monotypic genus was Claude Jourdan in his 1834 description of Avahi. Jourdan's prior description of the animal, Microrhynchus, was invalidated on account of the name having already been used by Johann Carl Megerle in 1823.[4] Jourdan used the skin and skull of Sonnerat's maquis as his holotype, and derived the generic name from the Malagasy term for the eastern woolly lemur: the onomatopoeic avahi or vahi, which imitate one of the animal's vocalizations.[18] Subsequent generic names include Avahis I. Geoffroy, 1835 as an correction of Jourdan's generic name, Habrocebus Wagner, 1839, Semnocebus Lesson, 1840, and Iropocus Gloger, 1841.[4]

The first taxonomic acknowledgement of variation within Avahi was described by Ludwig Lorenz von Liburnau in 1898, when he distinguished an eastern Avahi laniger laniger subspecies from a novel western A. l. occidentalis subspecies, which he based on a western woolly lemur skull and skin collected near Betsako by Alfred Voeltzkow in 1892. Both of the holotypes for Lorenz's subspecies, one of which was Sonnerat's maquis, were later lost from their museum collections in Paris and Vienna, and had to be substituted with neotypes.[18] Lorenz's taxonomy was used by scholars throughout most of the 20th century,[14] and would not become obsolete until 1990, when Rumpler et. al proposed elevating both A. l. laniger and A. l. occidentalis to specific statuses after modeling an infertile hybrid derived from the two taxa.[18] A third Avahi species, the Sambirano woolly lemur (Avahi unicolor), was described on account of morphological evidence published in 2000 by Urs Thalmann and Thomas Geissmann [de]. Thalmann and Geissmann described A. unicolor as constituting the northernmost of three discontinuous populations of western woolly lemurs, while also suggesting potential speciation between the central and southern populations.[23] They revisited Avahi in 2005, when they described the southernmost population as the Bemaraha woolly lemur (Avahi cleesei), with the "type specimen" being a collection of photographs, video evidence, morphometric data, and hair samples obtained from wild individuals that were released after examination. They named the species in honor of actor John Cleese for his contributions to lemur conservation.[10]

It was not until after all three extant species of western woolly lemur were described that the eastern A. laniger taxon was revised. Using mitochondrial DNA to calculate genetic distance, Zaramody et al. described the southern woolly lemur (Avahi meridionalis) and Peyrieras's woolly lemur (Avahi peyrierasi) in 2006, thereby relegating A. laniger to the northern half of its previously recognized range. At the time, they recognized two subspecies within A. meridionalis: A. meriodionalis meridionalis and Ramanantsoavana's woolly lemur (A. m. ramanatsoavanai), with the former constituting the majority of the species' range and the latter being confined to the Manombo Special Reserve and Agnalahaza Forest.[11] The following year, Andriantompohavana et al. performed the first comprehensive genetic study of all then-described woolly lemur species and subspecies. With these data, they recommended that A. m. meridionalis and A. m. ramanatsoavanai be elevated to specific statuses, as their genetic and morphological data exhibited greater disparities than those between other woolly lemur types that were already recognized as separate species. Additionally, they described a new eastern species, the Betsileo woolly lemur (Avahi betsileo), based on blood samples, measurements, and photographs.[12] The most recent woolly lemur species to be described is Moore's woolly lemur (Avahi mooreorum) of Masoala National Park, by Lei et al. in a 2008 revision of Avahi and Lepilemur. They named the species after the Moore Family and the Gordon and Betty Moore Foundation for their support of conservation efforts around the world.[13]

Anatomy and physiology

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Eastern woolly lemur skull

Woolly lemurs are the smallest living indriids. Head-body lengths range between 23 and 33 cm (9.1 and 13.0 in) and tail lengths range between 26.5 and 40 cm (10.4 and 15.7 in). Taken together, the average weight of woolly lemurs is 1 kg (2.2 lb), though this varies between species.[14] The body mass of woolly lemurs is small relative to other folivores.[24] Sexual dimorphism is minimal, though females are slightly larger than males,[25] and a dark scent gland beneath the mandible is more pronounced in males.[24] Woolly lemurs have long legs that faciliate their vertical clinging and leaping style of locomotion.[26] The average intermembral index is 57, which is one of the lowest among primates.[26] Woolly lemurs lack caudofemoralis muscles, which are almost ubiquitous across other primate taxa.[4] The digital formula is 4>3>5>2>1, which, among lemurs, is unique to indriids and the aye-aye. Most of the fingers are webbed about the proximal phalanges, with the index finger being free.[21] Woolly lemurs' heads have round appearances due to their large eyes, globular skulls, small ears, and flat muzzles.[21][27] This roundness is further accentuated by a short, wide nasal bone that is rooted in a deep maxilla.[4] The retina is almost entirely composed of rod cells,[4], which is a trait that is associated with nocturnality.[27]

The dentition of woolly lemurs has been the subject of controversy. Authors such as Charles Benjamin Bennejeant, Madeleine Friant, and Adolf Remane have constructed the permanent dental formula as 2.1.2.32.0.2.3 × 2 = 30, wherein the deciduous lower canines (dc−) are not replaced, which results in the characteristic four-toothed toothcomb of indriids. Conversely, William Warwick James and Daris Swindler each constructed the dental formula as 2.1.2.31.1.2.3 × 2 = 30, which posits that it is two of the deciduous lower incisors (di2) that are not replaced, and the permanent lower canines (C−) adopt an incisiform shape in the toothcomb. Both models are in agreement that the deciduous dental formula is 2.1.22.1.2 × 2 = 20, and that the permanent dentition lacks a pair of premolars that are present in many other lemurs.[27] The upper incisors (I1-2) are peg-shaped, and the internal pair (I1) are disastemic. The molars are bilophodont,[27] and have prominent buccal cusps. The third molar (M3 and M3) is much smaller than the first and second (M1–2 and M1–2).[21]

Woolly lemurs have large salivary glands. The stomach is sacculated and has a thick mucous membrane. The small intestine is over 14 times an individual's body length, and the cecum is so large that it is folded over itself five times. Woolly lemurs possess two large intestines. The first is in the shape of a tight spiral consisting of three loops called a tortillon. While the tortillon is also present in sifakas and the indri, it is smaller and less elaborate among woolly lemurs. Beyond the tortillon is a second, floating colon that is seamlessly connected to the rectum. Woolly lemurs lack gallbladders and have underdeveloped pancreases.[21]

The mask of a western woolly lemur

The pelages of woolly lemurs vary between species,[14] but generally consist of white, gray, red, and brown hues.[5] Species can also be distinguished by facial markings known as "masks." Facial patterns are influenced by environmental factors such as climate and vegetation. Species that live under dense forest cover are associated with having dark forehead and periorbital coloration, and species that live in an ecosystem with high annual rainfall are associated with more complex patterning than species in relatively dry climates.[28] All woolly lemurs have a white patch on the dorsal side of the thigh, which is visible while sitting in a typical upright clinging posture. With the exception of the dorsal thigh patches, all woolly lemurs exhibit countershading. Tails tend to be reddish relative to the rest of the pelage.[14]

Behavior

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Eastern woolly lemurs sharing a sleeping site

Woolly lemurs' daily activities are prompted by ambient light levels.[29] They are at their most active shortly after waking up during twilight, and they remain active throughout the rest of the night.[29][30] After waking, individuals engage in autogrooming before leaving their sleeping sites, after which they undertake the longest bout of daily travel.[24] A second period of high activity occurs around midnight, which is when foraging behaviors are most frequent.[24][29] Woolly lemurs take frequent rests throughout a night;[24][31] a 2004 study of unhabituated eastern woolly lemurs found that they spent 82% of their waking hours resting.[29] During the day, woolly lemurs may continue their foraging activities after dawn, after which they will sleep until the evening,[24] although some populations of southern woolly lemur are cathemeral.[30] Individuals typically huddle together in tree crowns during the day, but will sometimes sleep in separate trees.[24] They may move between trees during the day if they are exposed to too much sunlight.[24]

Social structure

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Woolly lemurs are monogamous, territorial[31] primates that live in small family groups consisting of a breeding adult pair and their offspring.[14] Woolly lemurs must be familiar with their small home ranges to efficiently exploit food resources from a limited supply of trees,[24][32][33] which results in a monogamous social structure, as male woolly lemurs cannot desert females after copulation because they would be unfamiliar with food distributions outside of their shared ranges. Other benefits of monogamy, such as protection from infanticide and predation, are byproducts of resource-knowledge monogamy.[32] No direct paternal care has been observed in woolly lemurs.[32][31] Both sexes participate in defending the borders of their territories from outgroup conspecifics, with intergroup conflicts consisting of chasing and reciprocal calling.[31] A 2008 study of western woolly lemurs found that they exhibit the lowest rate of agonism between pair-living partners among all lemurs,[34] however no studies have examined this pattern in other Avahi species.[35]

Diet

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Woolly lemurs are folivores and young leaf specialists;[24] a study of eastern woolly lemurs found that 98% of the surveyed individuals' diets were composed of young leaves.[29] Young leaves are preferred over mature leaves, as mature leaves have fewer free sugars and a greater quantity of harmful compounds.[24] Like other vertebrates, woolly lemurs are unable to digest cell walls of ingested food in their digestive tracts without the assistance of symbiotic microbes, many of which are housed in woolly lemurs' enlarged, sacculated ceca.[29]

Woolly lemurs are unusual in that they are among the smallest folivores.[36] Because leaves tend to be less nutritious than other food resources, most folivorous primates are large-bodied to efficiently ingest leaves in bulk quantities.[37] Additionally, woolly lemurs are vertical clingers and leapers, which is an energetically expensive mode of travel[29][33][37] that is usually practiced by specialist species that consume nutritionally-dense diets of gums, fruits, saps, or insects.[33] As such, woolly lemurs are metabolically constrained by their small body sizes, low-quality leafy diets, and nutritionally demanding locomotor method.[29] These challenges are overcome by being highly discriminatory with leaf selection; western woolly lemurs have been observed to closely inspect each leaf prior to consumption, possibly to discern nutritional quality.[33] Woolly lemurs forage more frequently in the first half of a night than in the later hours. This behavior replenishes nutrients lost during sleep,[29] and takes advantage of the high sugar contents of leaves that recently engaged in photosynthesis.[24] Studies of western and eastern woolly lemurs indicate that they prefer a narrow breadth of food resources that provide easily extractable proteins, avoid alkaloids, and do not discriminate against condensed tannins.[6][32] Tannin consumption slows down food passage rates in a woolly lemur's gut, which gives symbiotic microbes more time to digest cellulose.[6] Southern woolly lemurs deviate from this pattern insofar as they consume alkaloids, and maintain a comparatively generalist diet by diluting toxins in their digestive tracts with a variety of plant species.[37]

Circadian rhythm

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Southern woolly lemurs can be cathemeral.

Woolly lemurs are the only primates that are simultaneously nocturnal, folivorous, and monogamous.[6] They are secondarily nocturnal, as they evolved from a diurnal indriid ancestor.[16] Unlike many nocturnal animals, they have retained dichromatic vision from their diurnal ancestor. The rarity of nocturnal folivory among primates can be attributed to color vision being necessary to discern leaves that are rich in proteins,[30] and because leaves contain fewer sugars during the night than in daytime.[24] Several etiologies of this abnormal combination of behavioral traits have been proposed. Competition with extant, sympatric lemurs such as the indri is an unlikely explanation, as the woolly lemur practices successful resource partitioning with other folivores, with the exception of Verreaux's sifaka, with which hostile encounters have been documented. Nocturnal folivory in woolly lemurs may instead be a remnant of competition with extinct subfossil lemurs.[6] Predation could also influence this behavior, as many other nocturnal lemurs are attacked by diurnal hawks in the same manner that woolly lemurs are.[38]: 54  Nocturnality is not universally practiced across the genus. Southern woolly lemurs in the Tsitongambarika protected area are cathemeral, as they engage in foraging and other locomotor activites throughout the daytime with such regularity as to not be attributable to sleep disturbances. [30] It is possible that this behavior is a response to competition with sympatric species such as Fleurette's sportive lemur (Lepilemur fleuretae), as cathemerality has not been recorded in Avahi populations that are not in sympatry with sportive lemurs. Alternatively, this could be a predation avoidance tactic, as woolly lemurs do not shelter in tree hollows, as is the case with other nocturnal strepsirrhines.[30]

References

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  1. 1 2 Groves, C. P. (2005). Wilson, D. E.; Reeder, D. M. (eds.). Mammal Species of the World: A Taxonomic and Geographic Reference (3rd ed.). Baltimore: Johns Hopkins University Press. p. 119. ISBN 0-801-88221-4. OCLC 62265494.
  2. ↑ "IUCN 2014". IUCN Red List of Threatened Species. Version 2014.3. International Union for Conservation of Nature. 2012. Archived from the original on June 27, 2014. Retrieved 12 March 2015.
  3. ↑ McKenna, MC; Bell, SK (1997). Classification of Mammals: Above the Species Level. Columbia University Press. p. 336. ISBN 0-231-11013-8.
  4. 1 2 3 4 5 6 7 8 Tattersall, I. (1982). The Primates of Madagascar. New York City, NY: Columbia University Press. pp. 91–94, 137–138, 166, 186–187, 331. ISBN 0231047045.
  5. 1 2 Rowe, N. (1996). The Pictorial Guide to the Living Primates. pp. 47.
  6. 1 2 3 4 5 Ganzhorn, J.U.; Abraham, J.P. & Razananhoera-Rakotomalala, M. (1985). "Some aspects of the natural history and food selection of Avahi laniger". Primates. 26 (4): 452–463. doi:10.1007/BF02382459. S2CID 8988639.
  7. ↑ Rowe, N. (2016). All the World's Primates. Charleston, Rhode Island: Pogonias Press. p. 88. ISBN 9781940496061.
  8. ↑ Schülke, O; Kappeler, PM & Zischler, H (2004). "Small testes size despite high extra-pair paternity in the pair-living nocturnal primate Phaner furcifer". Behavioral Ecology and Sociobiology. 55 (3): 296–310. Bibcode:2004BEcoS..55..293S. doi:10.1007/s00265-003-0709-x. S2CID 28992136.
  9. ↑ Fietz J, Zischler H, Schwiegk C, Tomiuk J, Dausmann KH, Ganzhorn JU (2000). "High rates of extra-pair young in the pair-living fat-tailed dwarf lemur, Cheirogaleus medius". Behavioral Ecology and Sociobiology. 49 (1): 8–17. Bibcode:2000BEcoS..49....8F. doi:10.1007/s002650000269. S2CID 10644300.
  10. 1 2 3 Thalmann, U. & Geissmann, T. (2005). "New species of woolly lemur Avahi (Primates: Lemuriformes) in Bemaraha (Central Western Madagascar)". American Journal of Primatology. 67 (3): 371–376. doi:10.1002/ajp.20191. PMID 16287101. S2CID 1790777.
  11. 1 2 Zaramody A.; Fausser J.-L.; Roos C.; Zinner D.; Andriaholinirina N.; Rabarivola C.; Norscia I.; Tattersall I. & Rumpler Y. (2006). "Molecular phylogeny and taxonomic revision of the eastern woolly lemur (Avahi laniger)". Primate Report. 74: 9–22.
  12. 1 2 3 Andriantompohavana R.; Lei R.; Zaonarivelo J. R.; Engberg S. E.; Nalanirina G.; McGuire S. M.; Shore G. D.; Andrianasolo J.; Herrington K.; Brenneman R. A. & Louis E. E. Jr (2007). "Molecular phylogeny and taxonomic revision of the woolly lemurs, Genus Avahi (Primates: Lemuriformes)" (PDF). Special Publications of the Museum of Texas Tech University. 51: 1–64. Archived from the original (PDF) on 2014-02-03. Retrieved 2015-03-20.
  13. 1 2 3 4 Lei R.; Engberg S.E.; Andriantompohavana R.; McGuire S.M.; Mittermeier R.A.; Zaonarivelo J.R.; Brenneman R.A. & Louis E.E. Jr (2008). "Nocturnal Lemur Diversity at Masoala National Park" (PDF). Special Publications of the Museum of Texas Tech University. 53: 1–48. Archived from the original (PDF) on 2009-02-20. Retrieved 2009-05-22.
  14. 1 2 3 4 5 6 7 8 9 Mittermeier, R.A.; Louis Jr, E.E.; Richardson, M.; Schwitzer, C.; Langrand, O.; Rylands, A.B.; Hawkins, F.; Rajaobelina, S.; Ratsimbazafy, J.; Rasoloarison, R.; Roos, C.; Kappeler, P.M.; Mackinnon, J. (2010). "Indriidae". Lemurs of Madagascar (3rd ed.). Arlington, Va: Conservation International. pp. 481–513. ISBN 978-1-934151-23-5.
  15. ↑ Blench, Roger & Martin Walsh 2009. Faunal names in Malagasy: their etymologies and implications for the prehistory of the East African coast.
  16. 1 2 3 Roos, C.; Schmitz, J.; Zischler, H. (20 July 2004). "Primate jumping genes elucidate strepsirrhine phylogeny". Proceedings of the National Academy of Sciences. 101 (29): 10650–10654. Bibcode:2004PNAS..10110650R. doi:10.1073/pnas.0403852101. PMC 489989. PMID 15249661.
  17. 1 2 Rumpler, Y.; Warter, S.; Ishak, B.; Dutrillaux, B. (1 April 1989). "Chromosomal evolution in prosimians". Human Evolution. 4 (2): 157–170. doi:10.1007/BF02435444.
  18. 1 2 3 4 5 6 7 Rumpler, Y.; Warter, S.; Rabarivola, C.; Petter, J. J.; Dutrillaux, B. (January 1990). "Chromosomal evolution in Malagasy lemurs: XII. Chromosomal banding study of Avahi laniger occidentalis (Syn: Lichanotus laniger occidentalis ) and cytogenetic data in favour of its classification in a species apart— Avahi occidentalis". American Journal of Primatology. 21 (4): 307–316. doi:10.1002/ajp.1350210406. PMID 31963970.
  19. ↑ Rumpler, Y. (October 2000). "What Cytogenetic Studies May Tell Us about Species Diversity and Speciation of Lemurs". International Journal of Primatology. 21 (5): 865–881. doi:10.1023/A:1005598726749.
  20. ↑ Mittermeier, R. A.; et al. (2008). "Lemur Diversity in Madagascar". International Journal of Primatology. 29 (6): 1607–1656. Bibcode:2008IJPri..29.1607M. doi:10.1007/s10764-008-9317-y. hdl:10161/6237. S2CID 17614597.
  21. 1 2 3 4 5 6 7 Hill, W.C.O. (1953). "Family III. Indriidae". Primates: Comparative Anatomy and Taxonomy. Edinburgh: Edinburgh University Press. pp. 584–585, 588–590, 592–594.
  22. ↑ Forbes, H.O. (1896). Sharpe, R.B. (ed.). A Hand-Book to the Primates. London: Edward Lloyd Limited. p. 95.
  23. ↑ Thalmann, U.; Geissmann, T. (December 2000). "Distribution and Geographic Variation in the Western Woolly Lemur (Avahi occidentalis) with Description of a New Species (A. unicolor)". International Journal of Primatology. 21 (6): 915–941. doi:10.1023/A:1005507028567.
  24. 1 2 3 4 5 6 7 8 9 10 11 12 13 Warren, R.D.; Crompton, R.H. (October 1997). "A comparative study of the ranging behaviour, activity rhythms and sociality of Lepilemur edwardsi (Primates, Lepilemuridae) and Avahi occidentalis (Primates, Indriidae) at Ampijoroa, Madagascar". Journal of Zoology. 243 (2): 397–415. Bibcode:1997JZoo..243..397W. doi:10.1111/j.1469-7998.1997.tb02790.x.
  25. ↑ Oliver, L.K. (2017). "Indriidae". The International Encyclopedia of Primatology. Chichester, UK ; Hoboken, NJ: Wiley Blackwell. pp. 1–2. doi:10.1002/9781119179313.wbprim0061. ISBN 9780470673379. Retrieved 27 May 2026.
  26. 1 2 Tattersall, I.; Sussman, R.W. (1975). Lemur Biology. New York, NY: Plenum Press. p. 150. ISBN 0-306-30817-7.
  27. 1 2 3 4 Ankel-Simons, F. (2007). Primate Anatomy: An Introduction (3rd ed.). London: Elsevier Science & Technology. pp. 72, 77–78, 255, 257, 453, 475. ISBN 978-0-12-372576-9. Retrieved 16 May 2026.
  28. ↑ Rakotonirina, H.; Kappeler, P.M.; Fichtel, C. (9 November 2017). "Evolution of facial color pattern complexity in lemurs". Scientific Reports. 7 (1) 15181. Bibcode:2017NatSR...715181R. doi:10.1038/s41598-017-15393-7. PMC 5680244. PMID 29123214. Retrieved 28 May 2026.
  29. 1 2 3 4 5 6 7 8 9 Faulkner, A.L.; Lehman, S.M. (8 February 2006). "Feeding Patterns in a Small-Bodied Nocturnal Folivore (Avahi laniger) and the Influence of Leaf Chemistry: A Preliminary Study". Folia Primatologica. 77 (3): 218–227. doi:10.1159/000091231. PMID 16612096.
  30. 1 2 3 4 5 Campera, M.; Balestri, M.; Chimienti, M.; Nijman, V.; Nekaris, K.A.I.; Donati, G. (May 2019). "Temporal niche separation between the two ecologically similar nocturnal primates Avahi meridionalis and Lepilemur fleuretae". Behavioral Ecology and Sociobiology. 73 (5) 55. Bibcode:2019BEcoS..73...55C. doi:10.1007/s00265-019-2664-1.
  31. 1 2 3 4 Harcourt, C. (April 1991). "Diet and behaviour of a nocturnal lemur, Avahi laniger, in the wild". Journal of Zoology. 223 (4): 667–674. doi:10.1111/j.1469-7998.1991.tb04395.x.
  32. 1 2 3 4 Thalmann, U. (April 2001). "Food Resource Characteristics in Two Nocturnal Lemurs with Different Social Behavior: Avahi occidentalis and Lepilemur edwardsi". International Journal of Primatology. 22 (2): 287–324. doi:10.1023/A:1005627732561.
  33. 1 2 3 4 Warren, R.D.; Crompton, R.H. (December 1997). "Locomotor ecology of Lepilemur edwardsi and Avahi occidentalis". American Journal of Physical Anthropology. 104 (4): 471–486. doi:10.1002/(SICI)1096-8644(199712)104:4<471::AID-AJPA4>3.0.CO;2-V. PMID 9453697.
  34. ↑ Ramanankirahina, R.; Joly, M.; Zimmermann, E. (December 2011). "Peaceful primates: affiliation, aggression, and the question of female dominance in a nocturnal pair-living lemur ( Avahi occidentalis )". American Journal of Primatology. 73 (12): 1261–1268. doi:10.1002/ajp.20998. PMID 21905062.
  35. ↑ Kappeler, P.M.; Fichtel, C.; Radespiel, U. (2022). "The Island of Female Power? Intersexual Dominance Relationships in the Lemurs of Madagascar". Frontiers in Ecology and Evolution. 10 858859. doi:10.3389/fevo.2022.858859.
  36. ↑ Balestri, M. (2018). Ecology and conservation of the southern woolly lemur (Avahi meridionalis) in the Tsitongambarika Protected Area, south-eastern Madagascar. PhD (Thesis). Oxford: Oxford Brookes University.
  37. 1 2 3 Norscia, I.; Ramanamanjato, J.B.; Ganzhorn, J.U. (February 2012). "Feeding Patterns and Dietary Profile of Nocturnal Southern Woolly Lemurs (Avahi meridionalis) in Southeast Madagascar". International Journal of Primatology. 33 (1): 150–167. doi:10.1007/s10764-011-9562-3.
  38. ↑ Wright, Patricia C. (1999). "Lemur traits and Madagascar ecology: Coping with an island environment". American Journal of Physical Anthropology. 110 (S29): 31–72. doi:10.1002/(SICI)1096-8644(1999)110:29+<31::AID-AJPA3>3.0.CO;2-0.
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