How do animals of the same species get to other landmasses like bears being in the Americas and Eurasia?

Question

How do animals of the same species get to other landmasses like bears being in the Americas and Eurasia?

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Answer 1

Walking over the Bering Land Bridge during the Late Pleistocene, like many other mammals including humans.

It’s been determined through genetic studies that brown bears arrived in North America through 2 different routes. One walked along what was then the southern coast of Beringia and gave origin to the Kodiak grizzly bear that lives on islands off the coast of Alaska. The other followed a more northern route and originated the rest of North America’s grizzlies.