As Winter Warms, Bears Can't Sleep. And They're Getting Into Trouble. - The New York Times
Uncovering the enigmatic evolution of bears in greater depth: The hybrid origin of the Asiatic black bear
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The climate crisis has led to a strange new animal hybrid. Meet the 'pizzly bear.' - Upworthy
The Earliest Ursine Bear Demonstrates the Origin of Plant-Dominated Omnivory in Carnivora - ScienceDirect
Bears' seasonal hibernation linked to changes
Family finds a hibernating bear under their pool deck - Upworthy
Sloth bear Smithsonian's National Zoo
PDF) Cardiac adaptation in hibernating, free-ranging Scandinavian Brown Bears (Ursus arctos)
Regulation of protein and oxidative energy metabolism are down-regulated in the skeletal muscles of Asiatic black bears during hibernation