Brown-throated sloth

The brown-throated sloth (Bradypus variegatus) is a species of three-toed sloth found in the Neotropical realm of Central and South America.[1][3]

Brown-throated sloth[1]
Conservation status
Least Concern  (IUCN 3.1)[2]
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Order:	Pilosa
Family:	Bradypodidae
Genus:	Bradypus
Species:	B. variegatus
Binomial name
Bradypus variegatus Schinz 1825
Subspecies
7, see text
Brown-throated sloth range

It is the most common of the four species of three-toed sloth, and is found in the forests of South and Central America.[4]

Description

The brown-throated sloth is of similar size and build to most other species of three-toed sloths, with both males and females being 42 to 80 cm (17 to 31 in) in total body length. The tail is relatively short, only 2.5 to 9 cm (1.0 to 3.5 in) long. Adults weigh from 2.25 to 6.3 kg (5.0 to 13.9 lb), with no significant size difference between males and females. Each foot has three fingers, ending in long, curved claws, which are 7 to 8 cm (2.8 to 3.1 in) long on the fore feet, and 5 to 5.5 cm (2.0 to 2.2 in) on the hind feet.[5]

The head is rounded, with a blunt nose and inconspicuous ears. As with other sloths, the brown-throated sloth has no incisor or canine teeth, and the cheek teeth are simple and peg-like. They have no gall bladder, cecum, or appendix.[5]

The brown-throated sloth has grayish-brown to beige-color fur over the body, with darker brown fur on the throat, the sides of the face, and the forehead. The face is generally paler in color, with a stripe of very dark fur running beneath the eyes.[5]

The guard hairs are very coarse and stiff, and overlie a much softer layer of dense under-fur. The hairs are unusual in lacking a central medulla, and have numerous microscopic cracks across their surfaces. These cracks are host to a number of commensal species of algae, including Rufusia pillicola, Dictyococcus bradypodis, and Chlorococcum choloepodis. The algae are generally absent in the hair of young sloths, and may also be absent in particularly old individuals, where the outer cuticle of the hair has been lost.[5] Sloth hair also harbours a rich fungal flora.[6] Certain strains of fungi that grow on brown-throated sloth fur have been shown to possess anti-parasitic, anti-cancer, and anti-bacterial qualities.[7]

Over parts of its range, the brown-throated sloth overlaps the range of Hoffmann's two-toed sloth. Where this overlap occurs, the three-toed sloth tends to be smaller and more numerous than its relative, being more active in moving through the forest and maintaining more diurnal activity.[8]

• 
  Male showing black patch between shoulders
• 
  female
• 
  feeding

Distribution and habitat

The brown-throated sloth is the most widespread and common of the three-toed sloths. It is found from Honduras in the north, through Nicaragua, Costa Rica and Panama into Venezuela, Colombia, Ecuador, Bolivia, Brazil and eastern Peru.[2] It is probably not found north of the Amazon Rainforest or east of the Rio Negro, although its similarity to the pale-throated sloth found in these regions has led to some confusion in the past.[5]

It is found in many different kinds of environments, including evergreen and dry forests and in highly perturbed natural areas. It is generally found from sea level to 1,200 m (3,900 ft), although some individuals have been reported from much higher elevations.

Behaviour and diet

Brown-throated sloths sleep 15 to 18 hours every day and are active for only brief periods of time, which may be during either the day or night. Although they can walk along the ground, and even swim, they spend most of their lives in the high branches of trees, descending once every eight days or so to defecate in the soil. Large, curved claws and muscles specifically adapted for strength and stamina help them to keep a strong grip on tree branches.[9] They are able to withstand hanging inverted for extended periods of time due to fibrinous adhesions which attach their organs (such as their liver and stomach) to their lower ribs.[10] Given that feces and urine can account for up to a third of their body weight, this adaptation prevents these organs from pressing on the lungs when hanging upside down, making breathing easier.[10] Adult animals are solitary, except when raising young, and males have been observed to fight one another using their fore claws.[5]

Brown-throated sloths inhabit the high canopy of the forest, where they eat young leaves from a wide range of different trees. They do not travel far, with home ranges of only around 0.5 to 9 ha (1.2 to 22.2 acres), depending on the local environment. Within a typical, 5-hectare (12-acre) range, a brown-throated sloth will visit around 40 trees, and may specialise on one particular species, even spending up to 20% of its time in a single specific tree. Thus, although the species are generalists, individual sloths may feed on a relatively narrow range of leaf types.[5] Although they get most of their fluids from the leaves that they eat, brown-throated sloths have been observed drinking directly from rivers.[11]

In addition to the algae in their fur, brown-throated sloths also live commensally with a species of moth, Cryptoses choloepi, which lives in their fur, and lays its eggs in the dung.[12] Jaguars and harpy eagles are among the few natural predators of the brown-throated sloth. The yellow-headed caracara has been observed to forage for small invertebrates in the fur of the sloths, apparently without the sloth being disturbed by the attention.[13]

The female of the species is known to emit a loud, shrill scream during the mating season to attract males. Its cry sounds like "ay ay", much like that of a woman screaming. The male can be identified by a black stripe surrounded by orange fur on its back between the shoulders.

Reproduction

Brown-throated sloths have a polygynous mating system.[14] Studies of the brown-throated sloth indicate that mating is most common between January and March in at least the northern parts of its range, but this may vary elsewhere. Gestation lasts at least seven months, and the single young is born fully furred and clawed. Young sloths cling to the mother's underside for five months or more, even though they are fully weaned after just four to five weeks.[15]

The mammary glands of the females do not store significant quantities of milk as most other mammals do, since the infant sloth remains attached to the nipple at all times, and consumes the milk as soon as it is generated.[16] The young begin to take solid food as early as four days after birth, initially licking particles of food from their mother's mouths. This process apparently allows them to quickly identify edible leaves, and young sloths typically have the same preferences for leaf types as their mothers.[5]

In the wild, the lifespan of adult brown-throated three-toed sloths is typically between 30 and 40 years.

Taxonomy

The brown-throated sloth was first described by Heinrich Rudolf Schinz in 1825 from a South American specimen.[17] The type locality was later specified as "probably Bahia (Brazil)" by Robert Mertens in 1925.[18]

The seven recognized subspecies of the brown-throated sloth, although these are not all readily distinguishable, are:[1][19]

• B. v. boliviensis Gray, 1871
• B. v. brasiliensis Blainville, 1840
• B. v. ephippiger Philippi, 1870
• B. v. gorgon Thomas, 1926
• B. v. infuscatus Wagler, 1831
• B. v. trivittatus Cornalia, 1849
• B. v. variegatus Schinz, 1825

The closest living relative of the species is the pale-throated sloth, which has a very similar appearance, except for the color of the fur around the throat. The two species are estimated to have diverged just 400,000 years ago, whereas their ancestors diverged from the maned sloth over seven million years ago.[20]

References

1. Gardner, A.L. (2005). "Order Pilosa". In Wilson, D.E.; Reeder, D.M (eds.). Mammal Species of the World: A Taxonomic and Geographic Reference (3rd ed.). Johns Hopkins University Press. pp. 100–101. ISBN 978-0-8018-8221-0. OCLC 62265494.
2. Moraes-Barros, N.; Chiarello, A.; Plese, T. (2014). "Bradypus variegatus". The IUCN Red List of Threatened Species. IUCN. 2014: e.T3038A47437046. doi:10.2305/IUCN.UK.2014-1.RLTS.T3038A47437046.en. Retrieved 6 November 2019.
3. Gardner, A. L. (2007). "Bradypus variegatus Schinz, 1825". In Gardner, A. L. (ed.). Mammals of South America,. 1: Marsupials, Xenarthrans, Shrews, and Bats. Chicago: University of Chicago Press. pp. 161–164. ISBN 978-0-226-28240-4.
4. Emmons, Louise H.; Feer, François (February 1997). Neotropical rainforest mammals. A field guide (2nd ed.). Chicago: University of Chicago Press. p. 43. ISBN 978-0-226-20721-6. OCLC 44179508.
5. Hayssen, V. (2010). "Bradypus variegatus (Pilosa: Bradypodidae)". Mammalian Species. 42 (1): 19–32. doi:10.1644/850.1.
6. Higginbotham S, Wong WR, Linington RG, Spadafora C, Iturrado L, Arnold AE (2014). "Sloth hair as a novel source of fungi with potent anti-parasitic, anti-cancer and anti-bacterial bioactivity". PLOS ONE. 9 (1): e84549. Bibcode:2014PLoSO...984549H. doi:10.1371/journal.pone.0084549. PMC 3893167. PMID 24454729.
7. Higginbotham, Sarah; Wong, Weng Ruh; Linington, Roger G.; Spadafora, Carmenza; Iturrado, Liliana; Arnold, A. Elizabeth (2014-01-15). "Sloth Hair as a Novel Source of Fungi with Potent Anti-Parasitic, Anti-Cancer and Anti-Bacterial Bioactivity". PLOS ONE. 9 (1): e84549. Bibcode:2014PLoSO...984549H. doi:10.1371/journal.pone.0084549. ISSN 1932-6203. PMC 3893167. PMID 24454729.
8. Dickman, Chris (1993). Macdonald, David (ed.). The Encyclopedia of Mammals. p. 777.
9. Olson, Rachel A.; Glenn, Zachary D.; Cliffe, Rebecca N.; Butcher, Michael T. (2018-12-01). "Architectural Properties of Sloth Forelimb Muscles (Pilosa: Bradypodidae)". Journal of Mammalian Evolution. 25 (4): 573–588. doi:10.1007/s10914-017-9411-z. ISSN 1573-7055.
10. Cliffe, Rebecca N.; Avey-Arroyo, Judy A.; Arroyo, Francisco J.; Holton, Mark D.; Wilson, Rory P. (2014-04-30). "Mitigating the squash effect: sloths breathe easily upside down". Biology Letters. 10 (4): 20140172. doi:10.1098/rsbl.2014.0172. PMC 4013704. PMID 24759371.
11. Cliffe, Rebecca N.; Haupt, Ryan J. (2018). "Hanging out for a drink". Frontiers in Ecology and the Environment. 16 (8): 446. doi:10.1002/fee.1955. ISSN 1540-9309.
12. Waage, J.K. & Montgomery, G.G. (1976). "Cryptoses choloepi: a coprophagous moth that lives on a sloth". Science. 193 (4248): 157–158. Bibcode:1976Sci...193..157W. doi:10.1126/science.193.4248.157. PMID 17759254.
13. Krakauer, A.H. & Krakauer, T.H. (1999). "Foraging of yellow-headed caracaras in the fur of a three-toed sloth" (PDF). Journal of Raptor Research. 33 (3): 270.
14. Pauli, Jonathan N.; Peery, M. Zachariah (2012-12-19). "Unexpected Strong Polygyny in the Brown-Throated Three-Toed Sloth". PLOS ONE. 7 (12): e51389. Bibcode:2012PLoSO...751389P. doi:10.1371/journal.pone.0051389. ISSN 1932-6203. PMC 3526605. PMID 23284687.
15. Taube, E.; et al. (2001). "Reproductive biology and postnatal development in sloths, Bradypus and Choloepus: review with original data from the field (French Guiana) and from captivity". Mammal Review. 31 (3–4): 173–188. doi:10.1111/j.1365-2907.2001.00085.x.
16. Mirsky, Steve (2009). "The Bradypus Bunch". Scientific American. 300 (5): 34. Bibcode:2009SciAm.300e..34M. doi:10.1038/scientificamerican0509-34.
17. Schinz, H. R. (1825). Das Thierreich Eingetheilt nach dem Bau der Thiere als Grundlage ihrer Naturgeschichte und der Vergleichenden Anatomie [The Animal Kingdom Divided according to the Building of the Animals as the Basis of their Natural History and the Comparative Anatomy] (in German). Stuttgart and Tubingen: J. G. Cotta. p. 510.
18. Mertens, R. (1925). "Verzeichnis der saugetier-typen des Senckenbergischen Museums" [Directory of the mammal types of the Senckenberg Museum]. Senckenbergiana (in German). 7: 18–37.
19. Anderson, R.P. & Handley, C.O. Jr. (2001). "A new species of three-toed sloth (Mammalia: Xenarthra) from Panamá, with a review of the genus Bradypus". Proceedings of the Biological Society of Washington. 114 (1): 1–33. PDF copy Archived 2010-06-13 at the Wayback Machine
20. Barros, M.C.; et al. (2003). "Phylogenetic analysis of 16S mitochondrial DNA data in sloths and anteaters" (PDF). Genetics and Molecular Biology. 26 (1): 5–11. doi:10.1590/S1415-47572003000100002.

Further reading

• Data related to Bradypus variegatus at Wikispecies