One Family Tree •

But in 2017, a group of scientists determined using DNA and genetic testing that the wild pizzly bears all traced back to the same family tree, ending with one common relative — a female polar bear, known as Bear 10960. She had mated with two different grizzly bears, one of which she mated with twice. But what exactly was the catalyst for the bear’s inter-species breeding? Photo Credit: Raymond Gehman / Contributor / Getty Images

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