Three lions at Tama Zoological Park in Tokyo have died from suspected heatstroke as Japan endures an extreme heat wave, with several other lions undergoing treatment for heat-related illness.

Zoo officials cited dehydration and multiorgan failure tied to heat, and described containment measures such as cooling installations and improved ventilation to shield animals from exposure.

Since mid-July, ten of the zoo’s sixteen lions showed symptoms like loss of appetite and reduced activity before the fatalities.

The heat wave comes amid broader climate trends, including a Super El Niño event that is driving higher temperatures regionally and globally.

Experts say the ongoing El Niño pattern is elevating global temperatures, contributing to regional heat waves and more extreme weather.

Forecasters and the World Meteorological Organization warn that the Super El Niño is likely to intensify, potentially increasing above-normal temperatures worldwide and fueling heat waves, floods, and droughts.

The piece emphasizes how ongoing heatwaves affect both human health and animal welfare in a warming climate.

Investigations are ongoing to confirm the causes of death as test results are released, with veterinarians emphasizing heat stress in large felids.

The incident highlights the impact of extreme temperatures on captive wildlife and could prompt discussions about animal welfare and climate-related health risks at zoos.

Japan-wide temperatures are forecast to remain high in coming days, with many areas expecting 86–104°F, signaling no short-term relief from the heat.

In Kumamoto Prefecture, recovering from a recent earthquake, residents in shelters face extreme heat and water shortages, with at least one suspected heat-stroke death.

Advocacy group PETA criticized zoos for confinement and questioned whether lion welfare is adequately prioritized, arguing animals are born, live, and die in captivity without access to wild conditions.