Polar Bear Day Care.

Two tiny polar bear cubs poke their heads out of a hole and scan the snowy Arctic landscape. "Polar bear cubs learn by imitating", says Alysa McCall, a staff scientist at Polar Bears International. Hudson the polar bear, a resident of the Brookfield Zoo near Chicago, Illinois, is believed to be the first living adult polar bear to receive a CT scan - sort of like a detailed x-ray. Since global warming is shortening the lives of some polar bears in the wild, the ability to quickly identify health issues in zoo polar bears like Hudson is crucial. [Extracted from the article]