Welfare of Zoo Animals During Extreme Heat Events

Climate change is intensifying heat events that stress zoo animals, particularly those adapted to cooler climates.

Key Facts

Zoo animals from polar and temperate regions are particularly vulnerable to heat stress
Heat stress can cause hyperthermia, reduced immune function, and death
Zoos are increasingly investing in cooling systems for climate-sensitive species
The 2021 Pacific Northwest heat dome killed animals in some less-equipped facilities
Climate projections suggest increasing frequency and intensity of extreme heat events

Welfare Considerations

Zoo animals during extreme heat events experience thermal stress that ranges from discomfort to life-threatening hyperthermia. Polar bears, cold-water penguins, and boreal species are most vulnerable. Animals may not have access to adequate shade or cooling. Staff may not recognize early heat stress signs in unfamiliar species. As climate change intensifies heat events, zoo climate adaptation plans must prioritize animal welfare. Less well-funded zoos lack resources for adequate cooling infrastructure.

What You Can Do

Support well-resourced accredited zoos with climate adaptation plans
Donate to zoo welfare programs including cooling infrastructure
Advocate for climate action to reduce the frequency of extreme heat events
Report animals showing signs of heat stress to zoo management