Distribution and habitat

The western capercaillie (Tetrao urogallus), also known as the wood grouse, heather cock or capercaillie, is the largest member of the grouse family. The largest known specimen, recorded in captivity, had a weight of 7.2 kg (15.9 lbs). Found across Europe and Asia, it is renowned for its mating display.

Distribution and habitat

It is a sedentary species, breeding across northern parts of Europe and western and central Asia in mature conifer forests with diverse species composition and a relatively open canopy structure.

At one time it could be found in all the taiga forests of northern and northeastern Eurasia within the cold temperate latitudes and the coniferous forest belt in the mountain ranges of warm temperate Europe. The Scottish population became extinct, but has been reintroduced from the Swedish population; in Germany it is on the "Red list" as a species threatened by extinction, and is no longer found in the lower mountainous areas of Bavaria; in the Bavarian Forest, the Black Forest and the Harz mountains numbers of surviving western capercaillie decline even under massive efforts to breed them in captivity and release them into the wild; in Switzerland, in the Swiss Alps, in the Jura, in the Austrian and Italian Alps. The species is extinct in Belgium. In Ireland it was common until the seventeenth century, but died out in the eighteenth. In Norway, Sweden, Finland, Russia and Romania populations are quite big, and it is quite a common bird to see in the forested regions of these countries.

The most serious threats to the species are habitat degradation, particularly conversion of diverse native forest into often single-species timber plantations, and to birds colliding with fences erected to keep deer out of young plantations. Increased numbers of small predators that prey on capercaillies (e.g. red fox) due to the loss of large predators who control smaller carnivores (e.g. gray wolf, brown bear) also cause problems in some areas. In Sweden, Western capercaillies are the primary prey of the golden eagle.^[7] In some areas, declines are due to excessive hunting, though game laws in many areas have stopped this. It has not been hunted in Scotland or Germany for over 30 years.

Western capercaillies are not elegant fliers due to their body weight and short, rounded wings. While taking off they produce a sudden thundering noise that deters predators. Because of their body size and wing span they avoid young and dense forests when flying. While flying they rest in short gliding phases. Their feathers produce a whistling sound.

Дата добавления: 2015-11-16