Polar bear meets grizzly bear. They hit it off and have babies. Enter the grolar bears. Or pizzly bears, as some like to call them. It might sound like a BS made-up story, or something from Happy Feet ...
Polar bear genomes have retained mitochondrial DNA from ancient grizzly bears, and grizzlies have inherited genes from hybridizing with polar bears. “People worry that if they interbreed, polar bears ...
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