Born Free Foundation - Keep Wildlife in the Wild

Elephants do particularly badly in captivity and suffer physical and psychological disorders, high infant mortality and reduced longevity.  These ultra-sensitive, highly intelligent and complex creatures are entirely unsuited to zoos and may display abnormal behaviours, repeatedly swaying, rocking and shaking their heads.  Zoos still capture elephants from the wild to bolster failed captive breeding programmes.

More about captivity issues here