Polar Bears: The Natural History of a Threatened Species

摘要: No animal is more symbolic of the Arctic than polar bear. In short space 150,000 years, it has undergone behavioural and physiological changes to evolve from a grizzly bear into most specialized predator sea ice. Yet, its survival now threatened by global warming. Renowned Polar scientist Dr. Ian Stirling compresses 40 years research on these iconic mammals new comprehensive natural history. accessible language, he explains their evolution, life history, behaviour, how they are researched, current threat very existence. He also why bears Hudson Bay have become so important our understanding species, Churchill became The Bear Capital World