Strangest Hybrid Animals You’ve Never Heard Of in 22 minutes

Growler bears – also known as "pizzlies" or "grolar bears" – are living evidence that evolutionary boundaries are being erased by climate change. These two species diverged from a common ancestor approximately 600,000 years ago: the polar bear (Ursus maritimus) specialized for life on sea ice, while the grizzly bear (Ursus arctos horribilis) became a master of land-based adaptation. For hundreds of thousands of years, their paths never crossed. However, according to reports from National Geographic and Nature Climate Change, the melting of Arctic sea ice has pushed polar bears inland, forcing them into grizzly territory.