are found in lower altitudes during winter or when there is heavy snowfall. In parts of its range there appears to be a clear separation of the distribution of this and the Himalayan snowcock while in others they appear to overlap. Since the Tibetan snowcock has a large distribution range and no visible declines in population, it has been considered a species of "least concern" by the IUCN. Behaviour and ecology This species is similar to the Himalayan snowcock, but prefers higher altitudes. During winter, they descend to lower altitudes and move around in coveys. When approached from below on a hill slope, they move up, stopping every now and then to look at the intruder, but when alarmed they fly away downwards crossing the valley/ravine. The flight is swift and will often make a whistling call in flight. They call several times while alighting and on settling from flight they shake their tails several times in the manner of willow ptarmigan. They call in the morning and evening, becoming quiet in the middle of the day. They keep to grass-covered plateaus and ridges or to the more barren and stony plains with very little vegetation. Though they do not keep sentries during feeding, while resting in the middle of the day, one or more of adult birds mount high boulders and keep a watch, warning the flocks on the approach of danger with loud prolonged whistles. Several calls have been described that include a chuckling that gradually becomes louder, a whistle and a curlew-like call. During summer, they form pairs and males are believed to be monogynous. The nest is a scrape, sparsely lined and sheltered under a stone or bush usually on the leeward side of a bare hill, and avoiding ground with vegetation. About 4 to 6 eggs are laid. The male stands sentinel while the females incubate. Both parent birds accompany the brood and adults perform distraction displays when the young are threatened, while the chicks crouch or hide between stones. Broods of more than one female have been found to form a single foraging group. References External links Photos, videos and calls Tibetan snowcock Birds of Tibet Tibetan snowcock