By A Mystery Man Writer
The Captive': Cannes Review
Polar bears: The largest land carnivores
How does a polar bear kept in a zoo survive in warm weather? Does it need to be specially contained in a cold room during the summer? - Quora
America's oldest captive polar bear Berlin is euthanized at Kansas City Zoo aged 33
Polar bears may suffer stress from coping with rising temperatures
Born to Roam - The Suffering of Polar Bears in Zoos by BornFree - Issuu
Polar bear - Wikipedia
Surprising Polar Bear Facts About the King of the Arctic
Arctic Body Warmer – Captivity
Polar bears could be extinct by 2100 due to climate change, study warns