Oncilla

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Oncilla[1]
Conservation status

Vulnerable (IUCN 3.1)[2]
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Carnivora
Family: Felidae
Genus: Leopardus
Species: L. tigrinus
Binomial name
Leopardus tigrinus
(Schreber, 1775)
Synonyms

Oncifelis tigrinus
Felis tigrina

The Oncilla (Leopardus tigrinus), also known as the Little Spotted Cat, Tigrillo, Cunaguaro or Tiger Cat, is a small spotted felid found in the tropical rainforests of Central and South America. It is a close relative of the Ocelot and the Margay, and has a rich ochre coat, spotted with black rosettes. The Oncilla is a nocturnal animal, which hunts for rodents and birds.[3]

Contents

Appearance

The Oncilla is similar in appearance to the Margay and the Ocelot[4], but is smaller, with a slender build and narrower muzzle. It grows to be about 38 to 59 centimetres (15 to 23 in) long, plus a 20 to 42 centimetres (7.9 to 17 in) long tail.[5] While this is somewhat larger than the average Domestic Cat, Leopardus tigrinus is slightly lighter, weighing 1.5 to 3 kilograms (3.3 to 6.6 lb), less than a standard domestic cat.

The fur is thick and soft, ranging from light brown to dark ochre, with numerous dark rosettes across the back and flanks. The underside is pale with dark spots, and the tail is ringed. The backs of the ears are black with bold ocelli.[4] The rosettes are black or brown, open in the center, and are irregularly shaped.[6] The legs have medium-sized spots tapering to smaller spots near the paws.[6] The Oncilla's jaw is shortened, resulting in fewer teeth, but it does have well-developed carnassials and canines.[4]This coloration helps the oncilla blend in with the mottled sunlight of the tropical forest understory.

Some melanistic oncillas have been reported from the more heavily forested parts of its range.[5]

Behavior

The Oncilla is a primarily terrestrial animal, but is also an adept climber.[6] Like all cats, the Oncilla is an obligate carnivore, requiring meat for survival. This cat eats small mammals, lizards, birds, eggs, invertebrates, and the occasional tree frog. Occasionally, the cat will eat grasses.[6] They are generally nocturnal, but in areas such as Caatinga, where their main food source consists of diurnal lizards, they are more likely to be active during the day.[5]

The Oncilla stalks its prey from a distance, and once in range, it pounces to catch and kill the prey.[6][7] Young oncillas have been observed to purr, while adults are known to make short, gurgling calls when close to one another.[5]

Distribution and habitat

This species shows a strong preference for montane forest, and are usually found in elevations higher than those of the margay or ocelot.[8] They have been found in habitats as high as 4500m in Colombia, in the Andean highlands in Ecuador, and in the subtropical forest highlands in Brazil.[8] They have also been identified in cerrado and scrubland environments.[5] They are typically distributed from Costa Rica through Northern Argentina.[8] They have been recorded in northern Panama, but the remainder of the country appears to be a gap in the species' range.[9]

Reproduction

Estrus lasts from 3 to 9 days, with older cats having shorter cycles.[9] Oncillas produce 1 to 3 kittens (usually only one), after a gestation of 74 to 76 days.[9] The kittens' eyes open after eight to seventeen days, an unusually long period for a cat of this size. Unlike other cats, in which the incisor teeth tend to appear first, the teeth of an oncilla kitten erupt more or less simultaneously, at around 21 days of age.[10]. The kittens do not begin to take solid food until they are 38 to 56 days old (much older than in the domestic cat), but are fully weaned at three months.[5]

Oncillas reach sexual maturity at around two to two and a half years of age. They have a life span of about 11 years in the wild, but there are records of these cats reaching an age of 17 years.[9]

Subspecies

The following are the currently recognized subspecies:[1]

Although the Central American Oncilla is listed as a separate subspecies, based on analysis of mitochondrial DNA, Johnson et al. (1999) found strongly supported differences between L.t. oncilla in Costa Rica and L.t. guttulus in southern Brazil, comparable to differences between different neotropical species. Researchers have argued that there should be a splitting of the Oncilla into two species, as there is pronounced difference in appearance between the Oncillas in Costa Rica as compared to those in central and southern Brazil. Further samples of L.t. oncilla are needed from northern South America to determine whether this taxon ranges outside Central America, and whether it should be considered a distinct species rather than a subspecies.[11]

A zone of hybridization between the oncilla and the colocolo has been found through genetic analyses of specimens from central Brazil.[12]

Conservation

Oncillas are often killed for their fur

The International Union for the Conservation of Nature (IUCN) has classified the oncilla as vulnerable.[13] The chief threats to these felines are deforestation and poaching. Oncillas are killed for their pelts, which are highly prized and often sold or made into clothing.[13] Reports in 1972 and 1982 in South America showed that the Oncilla is one of the four most heavily hunted of all the small cats.[13]

Another factor contributing to Oncilla mortality is human expansion, settling what was once open terrain for wild cats.[14] Coffee plantations are most often established in cloud forest habitats, causing the reduction of preferred habitats. There are a few oncillas in captivity in North America, and a few in zoos in Europe and South America. In captivity, the Oncilla tends to have high infant mortality rate.[14] CITES places the Oncilla on Appendix I, prohibiting all international commerce in Oncillas or products made from them.[14]

Cat specialist groups are involved in studies and conservation of cats in all continents.[13] In situ management programs are increasingly being emphasized.[14] There is a breeding facility in Brazil for several small native felines, where their natural conditions and native food encourage reproduction similar to that in the wild.[13] Unfortunately, Oncilla habitats that still allow hunting are Ecuador, Guyana, Nicaragua, and Peru.[13]

References

  1. ↑ 1.0 1.1 Wozencraft, W. Christopher (16 November 2005). "Order Carnivora (pp. 532-628)". In Wilson, Don E., and Reeder, DeeAnn M., eds. Mammal Species of the World: A Taxonomic and Geographic Reference (3rd ed.). Baltimore: Johns Hopkins University Press, 2 vols. (2142 pp.). pp. 539. ISBN 978-0-8018-8221-0. OCLC 62265494. http://www.bucknell.edu/msw3. 
  2. ↑ de Oliveira, T., Eizirik, E., Schipper, J., Valderrama, C., Leite-Pitman, R. & Payan, E. (2008). Leopardus tigrinus. In: IUCN 2008. IUCN Red List of Threatened Species. Downloaded on 22 March 2009. Database entry includes justification for why this species is vulnerable
  3. ↑ http://www.nhm.org/cats/
  4. ↑ 4.0 4.1 4.2 Leyhausen, P. (1963). The South American spotted Cats. 
  5. ↑ 5.0 5.1 5.2 5.3 5.4 5.5 Sunquist, Mel; Sunquist, Fiona (2002). Wild cats of the World. Chicago: University of Chicago Press. pp. 130-134. ISBN 0-226-77999-8. 
  6. ↑ 6.0 6.1 6.2 6.3 6.4 Leyhausen, P. and Falken, M. (1979). Cat Behavior: The Predatory and social behavior of domestic and wild cats. 
  7. ↑ Prater, S.H. (1971). The book of Indian mammals 3D edn Bombay Natutal. 
  8. ↑ 8.0 8.1 8.2 Mondolfi, E. (1986). Notes on the biology and status of the small wild cats in Venezuela. pp. 125–146. 
  9. ↑ 9.0 9.1 9.2 9.3 Nowell, Kristin. Status Survey and Conservation Plan. 
  10. ↑ Quillen, P. (1981). "Hand-rearing the little spotted cat or oncilla". International Zoo Yearbook 21: 240-242. 
  11. ↑ 11.0 11.1 http://www.iucnredlist.org/apps/redlist/details/136876/0/full
  12. ↑ http://www.iucnredlist.org/apps/redlist/details/15309/0/full
  13. ↑ 13.0 13.1 13.2 13.3 13.4 13.5 Foreman, G.E. (1988). Felid bibliography. Felid Research and Conservation Interest Group and the International Society for Endangered Cats. pp. 34–72. 
  14. ↑ 14.0 14.1 14.2 14.3 Fuller, K.S. Swift, B, Jorgensen, A. and A. Brautigam (1987). Latin American Wildlife Trade Laws.