European bison
Description

The European bison is the heaviest surviving wild land animal in Europe. Similar to their American cousins, European bison were potentially larger historically than remnant descendants; modern animals are about 2.8 to 3.3 m (9.2 to 10.8 ft) in length, not counting a tail of 30 to 92 cm (12 to 36 in), 1.8 to 2.1 m (5.9 to 6.9 ft) in height, and 615 to 920 kg (1,356 to 2,028 lb) in weight for males, and about 2.4 to 2.9 m (7.9 to 9.5 ft) in body length without tails, 1.69 to 1.97 m (5.5 to 6.5 ft) in height, and 424 to 633 kg (935 to 1,396 lb) in weight for females. At birth, calves are quite small, weighing between 15 and 35 kg (33 and 77 lb). In the free-ranging population of the Białowieża Forest of Belarus and Poland, body masses among adults (aged 6 and over) are 634 kg (1,398 lb) on average in the cases of males, and 424 kg (935 lb) among females. An occasional big bull European bison can weigh up to 1,000 kg (2,200 lb) or more with old bull records of 1,900 kg (4,200 lb) for lowland wisent and 1,000 kg (2,200 lb) for Caucasian wisent.

On average, it is lighter in body mass, and yet slightly taller at the shoulder, than its American relatives, the wood bison (Bison bison athabascae) and the plains bison (Bison bison bison). Compared to the American species, the wisent has shorter hair on the neck, head, and forequarters, but longer tail and horns. See differences from American bison.

The European bison makes a variety of vocalisations depending on its mood and behaviour, but when anxious, it emits a growl-like sound, known in Polish as chruczenie (). This sound can also be heard from wisent males during the mating season.
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