Risultati di ricerca
4 giorni fa · The grizzly bear ( Ursus arctos horribilis ), also known as the North American brown bear or simply grizzly, is a population or subspecies [3] of the brown bear inhabiting North America . In addition to the mainland grizzly ( Ursus arctos horribilis ), other morphological forms of brown bear in North America are sometimes identified as grizzly ...
4 giorni fa · The polar bear is white- or yellowish-furred with black skin and a thick layer of fat. It is more slender than the brown bear, with a narrower skull, longer neck and lower shoulder hump. Its teeth are sharper and more adapted to cutting meat. The paws are large and allow the bear to walk on ice and paddle in the water.
4 giorni fa · Along with the brown bear (Ursus arctos), it is one of only two modern bear species not considered by the IUCN to be globally threatened with extinction. Taxonomy and evolution [ edit ] Despite living in North America, American black bears are not closely related to brown bears or polar bears ; genetic studies reveal that they split from a common ancestor 5.05 million years ago (mya). [3]
19 apr 2024 · Polar bear, great white northern bear found throughout the Arctic region. The polar bear is the largest and most powerful carnivore on land, a title it shares with a subspecies of brown bear called the Kodiak bear. It has no natural predators and knows no fear of humans, making it an extremely dangerous animal.
4 giorni fa · bear, (family Ursidae), any of eight species of large short-tailed carnivores found in the Americas, Europe, and Asia. The sun bear ( Helarctos malayanus) is the smallest, often weighing less than 50 kg (110 pounds). The largest bear is either the Kodiak bear ( Ursus arctos middendorffi, a subspecies of Alaskan brown bear; see also grizzly bear ...
7 mag 2024 · Polar-Bear/ Grizzly hybrids are fertile (Davis 1950) These pages are part of the San Diego Zoo Global Library website. Our website provides access to zoo, animal, plant, conservation, and veterinary information resources. Although the site is open to the general public, librarian services and some resources are reserved for SDZ Global staff and ...
7 mag 2024 · An ancestor of Brown and Polar Bears diverged from the European Cave Bears (U. spelaeus) around 1.6 million years ago. (Bon et al 2008) Cave Bears are sister to a clade of Brown and Polar Bears (Agnarsson et al 2010) Estimates vary widely for timing of Brown Bear and Polar Bears divergence (Lindqvist et al 2010) 1,320,000 to 200,000 years ago.
