Theoncilla (Leopardus tigrinus), also known as thenorthern tiger cat,little spotted cat, andtigrillo, is a small spottedcat ranging fromCentral America to centralBrazil. It is listed asVulnerable on theIUCN Red List, and the population is threatened bydeforestation and conversion of habitat to agricultural land.
In 2013, it was proposed to assign the oncilla populations in southern Brazil,Paraguay, andArgentina to a new species: thesouthern tiger cat (L. guttulus), after it was found that it does not interbreed with the oncilla population in northeastern Brazil.
The oncilla resembles themargay (L. wiedii) and theocelot (L. pardalis),[3] but it is smaller, with a slender build and narrower muzzle. Oncillas are one of the smallest wild cats in South America, reaching a body length of 38 to 59 cm (15 to 23 in) with a 20 to 42 cm (7.9 to 16.5 in) long tail.[4] While this is somewhat longer than the average domesticcat, the oncilla is generally lighter, weighing 1.5 to 3 kg (3.3 to 6.6 lb).[5]
A melanistic oncilla in a tree in Cerro de la Muerte, Costa Rica
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 white spots. The rosettes are black or brown, open in the center, and irregularly shaped. The legs have medium-sized spots tapering to smaller spots near the paws. This coloration helps the oncilla blend in with the mottled sunlight of the tropical forest understory. The oncilla's jaw is shortened, with fewer teeth, but with well-developed carnassials and canines.[3]
Somemelanistic oncillas have been reported from the more heavily forested parts of its range.[4]
The oncilla is a primarily terrestrial animal, but also an adept climber. It is anobligate carnivore that huntsrodents,lizards, birds, eggs, invertebrates, and occasionally alsotree frogs. It stalks its prey from a distance, and once in range, it pounces to catch and kill the prey.[10]Most oncillas arenocturnal, but in the BrazilianCaatinga – wherediurnal lizards are their main food source – they are active during daylight. Young oncillas have been observed to purr; adults are known to make short, gurgling calls when close to one another.[4]
Estrus lasts from three to nine days, with older cats having shorter cycles. Females give birth to one to three kittens after agestation of 74–76 days.[11] The kittens' eyes open after 8–17 days, an unusually long period for a cat of this size. Their teeth erupt more or less simultaneously at around 21 days of age.[12] The kittens do not begin to take solid food until they are 38–56 days old, but are fully weaned by the age 90 days.[4]
Oncillas reach sexual maturity around the age of 2–2.5years. They have a life span of about 11 years in the wild, but there are records of captive oncillas reaching age 17 years.[11]
Leopardus tigrinus guttulus, Atlantic forest central and southern Brazil,Uruguay,Paraguay, northernArgentina (later recognised as a separate species, thesouthern tigrina)
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 betweenL.t. oncilla in Costa Rica andL.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 a pronounced difference in appearance between the oncillas in Costa Rica and those in central and southern Brazil. Further samples ofL.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.[1]
In 2013, genetic research revealed that the former subspeciesL. t. guttulus is a separate cryptic species that does not interbreed with the other subspecies, and proposes a classification into two speciesL. guttulus andL. tigrinus.[13]
A zone of hybridization between the oncilla and thecolocolo (Pampas cat) has been found through genetic analyses of specimens from central Brazil.[14]
Results of a morphological analysis of 250 samples of skins and skulls indicate that there are three distinct oncilla groups: namely one in South America's northern, north-western and western range countries, one in eastern and one in southern range countries. Based on these results, the eastern group was proposed to be a distinct speciesLeopardus emiliae.[15] A further phylogenetic study published in 2021 supported the recognition of a third species.[16]
The oncilla is mainly threatened by deforestation andpoaching. Oncillas are killed for their pelts, which are highly prized and often sold or made into clothing.[1] Reports in 1972 and 1982 in South America showed that the oncilla is one of the four most heavily hunted of all the small wild cats.[17]
Another factor contributing to oncilla mortality is human expansion and conversion of land for settlements. Coffee plantations are most often established in cloud forest habitats, causing the reduction of preferred habitats.[18]
Hybridization of the oncilla with theGeoffroy's cat (Leopardus geoffroyi) has been found in the southernmost part of its range; hybridization with thePampas cat (L. colocola) has also been found in central Brazil. Such hybridization may be a natural process, and the extent of this as a threat to the oncilla is unknown.[19]
The oncilla has been classified asVulnerable on theIUCN Red List. It is listed onCITES Appendix I, prohibiting all international commercial trade in oncillas or products made from them.[1] Hunting is still allowed in Ecuador, Guyana, Nicaragua and Peru.[17]
^abForeman, G. E., ed. (1988). "Felid bibliography 1781-1988". Columbus, Ohio: Felid Research and Conservation Interest Group:34–72.{{cite journal}}:Cite journal requires|journal= (help)
^Fuller, K.S. & Swift, B. (1985).Latin American Wildlife Trade Laws. Washington, DC: Traffic (USA).
^Eizirik, E.; Trigo, T. C. & Haag, T. (2007). "Conservation genetics and molecular ecology of Neotropical felids". In Hughes, J. & Mercer, R. (eds.).Felid Biology and Conservation Conference 17–19 September. Oxford, UK: WildCRU. pp. 40–41.
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