Because of climate change, polar bears and grizzly bears have been interbreeding and producing fertile offspring, calling into question their classification as separate species. By Henry Taylor
Bring foreign species to Britain to stop them dying out, expert saysThe most famous definition of a species comes from the 20th century German-born biologist Ernst Mayr, who emphasised the importance of. The idea is that two organisms are of the same species if they can breed with one another to produce fertile offspring. That is why a donkey and a horse aren’t the same species: they can breed and produce offspring, but not fertile offspring.
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