среда, 25. март 2009.

Andean Cat (Leopardus jacobita)

The Andean Cat (Leopardus jacobita) inhabit the Andean mountain region of southern Peru and Bolivia to northern Chile and northwestern Argentina. The restricted range of Andean cats may be due to their specialized predation on mountain chinchillas and mountain viscachas, which also have a narrow habitat range in the high Andes mountains.

The habitat of this South American cat is very specialized. Andean cats are only known from the arid to semi-arid regions of the high Andes mountains. Preferred habitat is normally above timberline at 3000 to 4000 meters. This habitat is primarily very rocky with scattered bunchgrass, tola bushes, and other small shrubs (Parastrephia phylicaeformis, Tetraglochin alatum, Nassauvia azillaris). They also occur in high mountain grasslands with wet, grassy meadows and various shrubs.

Andean cats weigh only about 4 kg. The fur is thick, measuring 40 to 45 mm on the dorsal surface. Body color is pale silver or ash gray with irregular rust-colored spots. The spots are found in a general vertical line pattern along the body. Conspicuous dark stripes extend from the back down the sides of the animal and gray bars also run across the forelegs and chest. The belly is pale-colored with dark spots. The tail is thick and long with six to nine dark brown rings, the tip may be a pale white color in some individuals. The nose and lips are black with areas of white surrounding the edges of the lips, eyes and sides of the face. Also, dark stripes that start behind each eye meet those that run from the nose to the mouth. The spots on juvenile O. jacobita are more numerous and the rings on their tail are much narrower than an adult. As the cats age, their spot number decreases and the color of their coat also becomes lighter. Sexual dimorphism has not yet been observed. Body length ranges from 577 to 850 mm and the tail is about 70% of the body length at 410 to 485 mm. Their auditory bullae are greatly expanded.

Andean cats are thought to be primarily nocturnal, though some sightings have occurred during the day. They are very agile when hunting for their primary prey, mountain viscachas and mountain chinchillas. These cats will explore under and around boulders seeking their prey. While hunting, the tail is often held high in the air. The long tail of Andean cats is important in keeping balance and agility while hunting in rocky, mountainous terrain. From the few recorded observations, Andean cats appear to be solitary and unafraid of the presence of humans.

Andean cats are specialized predators of mountain chinchillas and mountain viscachas. However, these cats may eat reptiles, birds, and other small mammals, such as rabbits, and tuco tucos.

There are no known predators of Andean cats. However, this animal does possess a fur color pattern that allows it to blend in with its surrounding habitat. Humans may prey on Andean cats occasionally for their pelts.

Leopardus jacobitus is a very rare and elusive cat species. As of 2001, the population size of breeding O. jacobita was estimated to be below 2,500 animals and there are no known subpopulations with more than 250 mature individuals. Leopardus jacobitus is ranked as an endangered animal by the IUCN Red List as well as the U.S. Fish and Wildlife Service, and is listed in Appendix I by CITES. The Andean mountain cat is now protected throughout its geographical range.

In Argentina, Chile, and Bolivia Andean cats are protected against commercialization, trade, and hunting by law. Sometimes considered the least known of the world's cats, Andean cats may be endangered due to habitat deterioration and exploitation by humans for pelts. The declining abundance of their primary prey, mountain chinchillas and mountain viscachas, may have contributed the most to their low population numbers. Chinchillas were once hunted to the brink of extinction and population numbers remain low.





















































Kodkod (Leopardus guigna)

The Kodkod (Leopardus guigna), is found in central and southern Chile and Argentina. Guignas inhabit the moist temperate forests of the southern Andean and coastal ranges of Chile and Argentina. They occur to the treeline which ranges from 1900 to 2500 meters altitude. Most kokods have been recorded from the temperate moist Araucarian and Valdivian forests. Valdivian forests are characterized by a multi-layered structure with a bamboo understory and an abundance of epiphytes and lianas. Guignas also seem to be tolerant of disturbed habitats, they have been captured in settled and cultivated areas and in secondary forest and shrub. Guignas are most common on Chiloe and Guaitecas islands.

Guignas are small felids measuring 58.5 cm to 68 cm in length, including the tail. They are the smallest cat species in the western hemisphere. They are buff or grey brown in color. Kodkods are marked with round blackish spots on upper and lower parts, with some black streaking on the head and shoulders. The tail is narrowly ringed with black color and the backs of the ears are black with white spots (Alderton 1993). There is a high incidence of melanism, which seems to increase with latitude. Guignas may be a subspecies of Geoffroy's cat, Oncifelis geoffroyi.

Almost nothing is known about the reproduction and growth of kod kods in either the wild or in captivity. A typical litter size is two or three offspring. Reproductive maturity of one female was attained at 24 months of age.

Guignas are nocturnal and highly arboreal, taking to the trees when pursued and to rest. It has been suggested that they are social and live in packs but there is no evidence for this assertion.

Little is known about their prey, but guignas are known to eat small mammals and birds. There is at least one report of this species raiding chicken-houses in groups, but this is not verified and is considered unlikely to be common by some experts.

Guignas were once common but habitat loss has led to population declines, particularly in the northern areas of their range where human populations are highest. Populations in the southern parts of their range may be protected because these areas are heavily forested and sparsely populated. These cats may continue to thrive in areas of altered habitat such as pine and eucalyptus plantations, however, if prey populations continue to do well.
































Geoffroy's Cat (Leopardus geoffroyi)

Leopardus geoffroyi (Leopardus geoffroyi) occurs throughout most of the southern half of South America. This includes Argentina, Chile, Bolivia, Patagonia, Brazil, Paraguay, and Uraguay. Tge species is widely distributed with the exception of southern Chile, where it is only found east of the Andes.

L. geoffroyi has a widely varied habitat, and occurs from sea level through 3,500 m elevations. It primarily lives along rivers in dense, scrubby vegetation. It has also been found in open woodlands and savannas, marshes and even grasslands, although it avoids open areas. These felids are sometimes arboreal, and a high percentage of its feces is found in trees. They are also very good swimmers.

Geoffroy's cat is a small wild cat, about the size of a large domestic cat, with males being larger than females. The head and body length of this cat ranges from 422 to 665 mm, with the tail adding an additional 240 to 365 mm to the total length. It weighs from three to five kg and stands about 30 cm high. Its coat color varies from a silver-grey to a yellowish-brown. The color of the fur varies geographically, with the more yellow forms in the northern part of the species' range, and the more silver colored forms in the south. The fur is marked with a pattern of small, uniformly spaced, dark brown or black spots all over the body. Two black streaks run down each cheek. Melanism is fairly common. The tail is ringed.

Females go into estrus about every twenty days, with estrus lasting two to six days. The mating system of this felid is unknown. However, the home ranges of adult males overlap those of several adult females, but do not overlap those of other males (Nowak, 1999; Garman, 1997; IUCN, 1996). This, coupled with the larger size of males, indicates some level of competetion between males for mates, and therefore some level of polygyny.

Breeding season for L. geoffroyi occurs from December to May. Females may produce one litter of one to four cubs per year. Geoffroy's cat frequently mates in trees.

The females have a gestation period of 67-78 days. The female gives birth in a den of bushes, a rock crevice, or sometimes even a nook in a tree (Garman,1997). Young weigh 65-123 g at birth. They are born blind, but their eyes open within 8-12 days. They develop quickly. They can stand at about four days old, and by six weeks are fearless climbers. They can walk after two or three weeks. These cats are weaned at 8 to 10 weeks and become completely independent of the mother after about eight months. Sexual maturity is reached between 14 and 24 months.

L. geoffroyi is primarily nocturnal, but has been seen hunting at dawn and dusk. It likes water, and is an avid swimmer. Secretive and solitary, it spends much of its time in the trees. These cats have been known to sleep and mate in the trees. They are quite agile, and have even been known to walk on the underside of a branch. Males and females do not interact much, other than to mate. Females home ranges are about 2.5 square km. Males territories may be as much as three times the size of females. Female ranges may overlap each other, as well as males ranges. Although male ranges may overlap the females ranges, they do not overlap other males. They have a density of about 1.2 individuals per ten square km. Most people are not scared of this small cat, but should be, because it is very aggressive, and has never been truly domesticated.

This felid is a hunter, and not a very picky one. It includes a wide variety of animals in its diet, which is dominated by introduced prey, specifically European hares. It will eat just about any kind of meat it can get a hold of; however its most abundant food items are hamsters and hares. P. geoffroyi hunts in trees and on the ground, and is also known to fish (Novaro,1999; IUCN,1996).

Foods eaten include: birds, fish, amphibians, reptiles, rodents, wild guinea pigs, small agoutis, hares and other small mammals.

L. geoffroyi is the least protected of all the small cats, having the lowest AZA conservation rank. They are the most common wild cat in South America. However, they are also the most commonly hunted, and population trends are that they are decreasing. IUCN lists the species as Near Threatened, and change the status to Vulnerable if the downward population trend continues. CITES lists the species as Appendix I.

In the seventies and eighties, L. geoffroyi was heavily hunted for fur coats, which was legal at the time. It takes approximately 25 cat skins to make one fur coat. 350,000 skins were exported between 1976 and 1979 in Argentina alone, and over 500,000 total from South America in the early eighties. The fur trade has since declined, but about 55,000 pelts are still traded yearly. However, it is believed that most of these pelts are from cats killed that were pests or threats to livestock populations. Commercial hunting has essentially ceased, but these cats are still considered endangered. Habitat destruction also affects these cats. Not enough time has passed since the hunting has been stopped to determine their status, but they are now fully protected.











































Colocolo (Leopardus colocolo)

Pampas cats, Colocolo (Leopardus colocolo), have an expansive geographic range. In fact, they have been said to have a greater geographic range than any other South American cat. They are found in the forested slopes of the Andes in Ecuador, Peru, and Bolivia, the cloud forests of Chile, the Paraguayan chaco, open woodland areas of central, western, northeastern, and southern Brazil, the pampas of Argentina and Uruguay, and southern Patagonia.

Just as the geographic range of the species varies widely, so does the habitat in which it is found. It can be found in open woodland or scrub thicket, cloud forest, cold, semi-arid desert regions, low-lying swamps, floodplains, and mountainous slopes. The only forest regions it has not been found to inhabit throughout its range are lowland tropical and temperate rain forests.

The physical characteristics of L. colocolo vary across its range in South America. In the high Andes it is gray in color and has reddish stripes that are broken up into spots. In Argentina, the coat of L. colocolo is generally longer and yellow-brown in color with a muted pattern. Long fur is also typical to those individuals living in Brazil, but they tend to be rust colored with black bands on their yellow to orange sides and their lateral underparts.

A three month old male pampas cat from central Brazil that was brought into a zoo had the typical rusty color but also had very dark, irregular stripes over its entire body. By the time it had reached eight months of age, the dorsal and lateral striping had disappeared, and only the stripes on the limbs and underparts remained.

Ears of L. colocolo are large and more pointed than most other small, neotropical cats. Typical head and body length is 435-700 mm, tail length is 220-322 mm, and shoulder height is 300-350 mm. Average weight is 3 to 7 kg.

The mating system and behavior of this animal are not known.

L. colocolo in captivity in the northern hemisphere breeds period from April to July. Gestation is from 80 to 85 days, and 1 to 3 young are born per litter. Breeding season in the wild is unknown.

Longevity in this species has not been reported. However, other felid species of similar size typically live between 10 and 15 years.

L. colocolo is predominantly nocturnal and terrestrial. In the wild individuals have been observed during the day. Also, it should be noted that a male at Brazil’s Parque Zoológico de Goiânia was a skilled tree climber, spending most of his resting periods draped over the highest fork of the tree in his enclosure. Very little is known about the social structure and communication methods of this species. Individuals in captivity have been observed erecting the crest of long hair along their midline from head to tail when excited.

L. colocolo preys upon small mammals, such as guinea pigs, as well as ground-dwelling birds. It has been observed taking penguin eggs and chicks from nests. Pampas cats are known to take poultry in areas of human population.

A taxonomic study of 96 museum specimens has led to the suggestion that Leopardus colocolo may in fact be three separate species. These three species are:
  • Leopardus pajeros (in the high Andes from the Equator to Patagonia and throughout Argentina)
  • Leopardus braccatus (Brazil, Paraguay, and Uruguay)
  • Leopardus colocolo