European bison  (Bison bonasus)

The European bison, or 'wisent', is similar in appearance to its North American relative (Bison bison) (3). Although smaller in size (3), they have the characteristic thickset body shape with a short neck and a pronounced shoulder hump (2). There is a longer mane of hair underneath the neck and also on the forehead (2). The dense coat is dark to golden brown in colour (2), but is less shaggy than that of the American bison (3). Both sexes bear short horns that project outwards and then curve up (2).

The European bison previously roamed throughout western, central and southeastern Europe but by the beginning of the 20th Century persisted only in two protected ancient forests in Poland and the former Soviet Union (4) (5). By 1927, the species had been lost from the wild entirely and only 54 individuals survived in European Zoos (5). Re-introductions to forests in Belarus, Poland, Russia, Lithuania and the Ukraine (5).

Inhabits mixed forests, with undergrowth and open spaces (6).

European bison have an extremely similar social system to their American relatives, and are believed by some to represent the same species (7). Outside of the mating season the males form bachelor herds, whilst females are found in maternal groups of around 20 individuals and their young (2). These female groups occupy vast home ranges of up to 100 km2 and are led by a dominant cow (5). The 'rutting' season takes place between August and October and during this time males join up with the female herds and compete for access to receptive females (5). Once he has found an appropriate cow the bull will attempt to separate her from the remaining herd and particularly from the advances of other males in the group (3). He will attend to her in this way for around a day before mating (3). Aggressive clashes between rival males may occur at this time. Cows give birth after a gestation period of about 264 days, typically in May and July, usually leaving their herd to do so; young calves are able to run after only a few hours of being born and are fully weaned at around one year old (5).

Bison feed predominantly on grasses although they will also browse on shoots and leaves; in summer months, an adult male can consume 32 kilograms of food in a day (5). Bison in the Bialowieza Forest in Poland have traditionally been fed hay in the winter for centuries, and vast herds may gather around this diet supplement (5). Bison need to drink every day and in winter can be seen breaking ice with their heavy hooves (2). Despite their usual slow movements, bison are surprisingly agile and can clear three metre wide streams from a standing start (2).

With the advance of agriculture, vast tracts of the European bison's habitat were lost and their range became massively restricted (5). These animals were also persecuted by hunting and in 1927 the species finally became Extinct in the Wild (5). Re-introductions of the bison to some of its former range have proved extremely successful and, due to the natural low mortality of the species, it has even been necessary to cull some populations in order to manage them effectively (5).

The protection of the European bison has a long history; between the 15th and 18th Century those in the Tzar's Royal Hunting Forest of Bialowieza were protected and their diet supplemented (3). Efforts to restore this species to the wild began in 1948 with the establishment of the Bison Breeding Centre within the Prioksko-Terrasny Biosphere Reserve (8). Re-introductions of captive-bred individuals to this area began in the 1950s and the herds have grown successfully (3); re-introductions to date have occurred in Belarus, Poland, Russia and the Ukraine (5). The aim of the Bison Specialist Group of the World Conservation Union (IUCN) is to establish a total free-ranging population of around 6,000 animals from two different lineages (4). The re-introduction of the European bison represents a remarkable conservation success story.

For more information on the bison see:

• Ultimate Ungulate:
  www.ultimateungulate.com
• Bison Specialist Group:
  www.notitia.com/bison/index.htm

This information is awaiting authentication by a species expert, and will be updated as soon as possible. If you are able to help please contact:
arkive@wildscreen.org.uk