Problem
a) What is the brown bear's range in North America at the present time?
b) Does physical variation exist in this species, especially in terms of fur colour and size? Explain.
c) Are any identified subspecies of the North American brown bear found only in North America? If so, what are they and where are they found?
d) The North American brown bear belongs to the species Ursus arctos, while the polar bear belongs to the species Ursus maritimus. What differences between the brown bear and the polar bear provide evidence that these two types of bears belong to separate species? Remember that this evidence could exist in the form of physical differences, ecological differences, or differences in patterns of geographic distribution.