Bear hibernation: More than a winter’s nap - https://knowablemagazine.org/article/living-world/2022/bear-hibernation-more-winters-nap 

Bears avoid muscle atrophy during “hibernation” — and it’s mainly due to their superblood - https://www.zmescience.com/science/bears-avoid-muscle-atrophy-during-hibernation-and-its-mainly-due-to-their-blood-18072022/

fascinating-little-known-facts-about-polar-bears - http://list25.com/25-fascinating-little-known-facts-about-polar-bears/?view=all

Snoozing in flower beds? Behold the bears of summer -- https://www.nationalgeographic.com/animals/article/snoozing-in-flower-beds-behold-the-bears-of-summer

China zoo says its bears aren’t people in bear costumes - https://www.zmescience.com/ecology/china-zoo-says-its-bears-arent-people-in-bear-costumes/