The East Caucasian tur or Daghestan tur is a mountain-dwelling caprine found only in the eastern half of the Greater Caucasus Mountains. The East Caucasian tur lives in rough mountainous terrain, where it eats mainly grasses and leaves and is preyed upon by wolves and lynxes. It is sometimes considered a subspecies of the West Caucasian tur, and sometimes as a full species in its own right. The species is listed as Near Threatened by the IUCN.
Description
East Caucasian turs are goat-like animals with large but narrow bodies and short legs, and show significant sexual dimorphism in overall size and horn development. Adult males stand about at the shoulder, measure in head-body length, and weigh around. The equivalent figures for adult females are for shoulder height, for head-body length, and just for weight. Males have slightly lyre-shaped horns which reach in length, while in females they are typically only long. The summer coat is short and sandy-yellow, with dirty white underparts. Also, dark brown stripes occur along the front surface of the legs and on the upper surface of the tail. In the winter, the coats of females and juvenile males becomes slightly greyish in colour, but otherwise remain similar. However, the winter coats of adult males are a solid dark brown, without visible stripes on the legs. Males develop a beard with their winter coats in their second year, reaching the full length of about by their fourth or fifth year. Compared with other goats, the beards of East Caucasian turs are relatively stiff, and project somewhat forwards, rather than drooping down. The beard is small or entirely absent in females, and in males in their summer coats.
Distribution and habitat
The species range is restricted to the Greater Caucasus Mountains between above sea level, roughly extending from Mt. Shkhara in the west to Mt. Babadag in the east. The western edge of the range of the East Caucasian tur remains unclear, as it overlaps with that of West Caucasian tur. Most of the species populations avoid human disturbance and occur in extremely rugged, open terrain around 3,000 m. In areas with no or little human disturbance, turs occur in gentler and much lower terrain. The species is heat-sensitive but prefers snow-free, grass-dominated areas near escape cliffs, and in terrain that is difficult for humans and livestock to reach. A fragment of a land with optimal terrain, climate, and degree of human disturbance for the species' occurrence is more likely to contain the species if the area of the fragment is larger and its distance to the species' nearest source population is shorter.
Reproduction
Breeding occurs from late November to early January, with births taking place in May and June, after a gestation period of 160 to 165 days. Newborn turs weigh ; they are usually singletons, although about 3% of pregnancies result in twin births. Young turs are extremely agile, being able to scamper about steep slopes after only a day of life. They generally start sampling grasses after one month, but continue to suckle until about December. Growth is relatively slow, with females not reaching their full adult size for five years, and males at around 10 or 11 years of age. Females reach sexual maturity at two years, but, in the wild, usually do not breed until the age of four. East Caucasian turs are able to cross-breed with West Caucasian turs and with domestic goats, producing fertile offspring, although this is not common in the wild.
Diet and behaviour
During the warm months, feeding occurs at intervals throughout the late afternoon, night, and morning, with the hottest hours of the day being spent resting in sheltered places. In winter, herds may remain in open pastures throughout the day, alternately grazing and resting. Daily movements may cover. They eat almost all kinds of available vegetation, but prefer forbs in spring and summer, and grasses, trees, and shrubs in autumn and winter. Their seasonal migration covers a vertical distance of, with an upward thrust in May and a retreat downwards in October. The adult males generally inhabit higher altitudes than females and their young, descending to join them in the breeding season. During the summer, the turs also make daily migrations, moving as much as vertically between feeding meadows and night-time resting spots. During this rut, vigorous competitions arise as males vie for mating rights. Older males are dominant over younger ones, which they drive away from females using threatening postures, rushing, and occasional clashes with their horns. Fights between equally sized males are fiercer, beginning with both animals rearing on their hind legs and butting each other, before vigorous horn-wrestling that often results in the combatants rolling down steep slopes until one submits and leaves the group. During the rut, males also mark their territory by debarking and scent-marking tree trunks and heavy branches. Outside of the rutting season, females live in stable groups with an average of seven individuals, often including a few juvenile males. Older males live in larger, single-sex groups, with an average of 12 members, while some younger males travel in groups of two or three. These male groups break up around November, when the rut begins and mixed-sex groups become the norm, reforming again in January or February. In protected areas, the density of animals varies between.
