The difference is that one is a family and one is a class. Other than that, there really is no difference, they both define bears.
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scientists who studying ursus-one type of Ursidae
Polar bears belong to the kingdom Animalia, phylum Chordata, class Mammalia, order Carnivora, family Ursidae, genus Ursus, and species Ursus maritimus.
Just by looking at the genus name of the animal. The Genus and species name of the Giant Panda is Ailuropoda melanoleuca, whereas the Genus and Species name of the Polar bear and Grizzly bear are Ursus maritimus and Ursus arctos horribilis, respectively. All three species of bears, however, are all a part of the Family Ursidae.
Ursus arctos and Ursus maritimus are both species within the Ursus genus of bears. They are not closely related in terms of genetics, as they have evolved separately to adapt to different environments. Ursus arctos, or brown bear, is found in various habitats across Europe, Asia, and North America, while Ursus maritimus, or polar bear, is found in the Arctic region.
The Kodiak Bear's scientific name, given in Latin, is Ursus arctos middendorffi, a subspecies of the Brown Bear (Ursus arctos).