Zoo Adverisement

The condition of the animals varies widely, especially in zoos in countries with little or no regulations. The majority of the large non-profit and scientifically oriented institutions are working to improve their animal enclosures, although constraints like size and expense make it difficult to create ideal captive environments for some species, such as dolphins and whales.
Some critics argue that animals that live in zoos are treated as voyeuristic objects rather than living creatures, and are often driven to insanity in the transition from being free and wild to incarcerated and dependent on humans for survival.
A four-decade Oxford University study found that polar bears, lions, tigers, and cheetahs show the most evidence of stress in captivity. A PETA investigation of zoos in the U.S. found that several bear species were engaging in neurotic, stereotypical behavior, including pacing, walking in circles, and swaying or rolling their heads. The Badaltearing Safari Park in China keeps a pair of moon bears in cages so small that they are unable to turn around. The Daily Mail reported in January 2008 that one of them appeared to have gone insane and spends its time shaking its head and banging into the sides of the cage.