How species form: What the tangled history of polar bear and brown bear relations tells us

Source: ScienceDaily

A new study is providing an enhanced look at the intertwined evolutionary histories of polar bears and brown bears. Becoming separate species did not completely stop these animals from mating with each other. Scientists have known this for some time, but the new research draws on an expanded dataset — including DNA from an ancient polar bear tooth — to tease out more detail.

https://www.sciencedaily.com/releases/2022/06/220606181204.htm