Strict vegan diet of cave bears caused their demise
Biomechanical simulations reveal a trade-off between adaptation to glacial climate and dietary niche versatility in European cave bears | Science Advances
Cave Bears Probably Did Eat Their Vegetables - Sciworthy
An inflexible diet led to the disappearance of the cave bear
Ursus spelaeus (Cave Bear)
Why Europe's Cave Bears Were—and Weren't—Made for Hunkering Down - Atlas Obscura
European Cave Bear - Ursus spelaeus - Carnivora
Cave bear | Size, Weight, Extinction, & Facts | Britannica