Koalas are one of the most specialized mammals on Earth, with welfare in captivity depending on specific dietary, environmental, and health management considerations that make them among the most challenging zoo animals to maintain.
Koalas present extreme welfare challenges in captivity. Their entire physiology and behavior is adapted to a specific ecological niche that is difficult to replicate in zoo settings. The requirement for fresh, diverse eucalyptus is logistically demanding. Captive koalas are prone to chlamydial disease causing painful eye infections and reproductive tract damage. They are extremely sensitive to handling stress and can die from acute physiological stress responses to capture. Overhandling for visitor interactions - which many zoos permit as a revenue driver - is a significant welfare concern, as the stress of repeated tourist contact affects immune function and overall health.