Three lionesses have died from suspected heatstroke at Tokyo's Tama Zoological Park amid record-breaking heatwaves. The zoo has suspended public viewing of its lions as staff treat the remaining animals and implement enhanced cooling measures.
Lion Deaths at Tama Zoological Park
Tama Zoological Park in Tokyo has suspended public viewing of its lions after three lionesses died from suspected heatstroke amid extreme summer temperatures. The zoo confirmed the deaths of Mugi (3 years old), Ichigo (11), and Luena (15) between July 28 and August 1. Ten of the park’s 16 lions have shown symptoms since mid-July. The exhibit remains closed as staff continue treatment for the remaining animals.
Zoo Confirms Heatstroke as Cause of Deaths
The park’s spokeswoman stated that veterinarians suspect heatstroke as the cause, citing dehydration and multiple organ failure in post-mortem examinations. The lions exhibited symptoms including loss of appetite, lethargy, and inability to stand. Staff administered intravenous fluids, water sprays, and ventilation, but the animals did not recover.
Japan's Extreme Heat Triggers Emergency Responses
Japan has recorded temperatures exceeding 40°C in recent weeks, with authorities designating the conditions as “cruelly hot days.” The fire and disaster management agency reported 18,600 heatstroke hospitalizations between July 20–26, including 45 fatalities. The zoo attributed the sudden onset of severe heat to the abrupt end of the rainy season in late July.
Climate Change Cited as Exacerbating Factor
Scientists link the extreme heat to human-induced climate change, noting an increase in the frequency and intensity of such events. Japan’s highest recorded temperature, 41.8°C in Isesaki (August 5, 2025), underscores the severity of the conditions. The zoo has pledged to enhance cooling measures, including additional water sprinklers, improved ventilation, and spot air conditioners.
Animal Welfare Groups Call for Broader Reforms
Critics argue that the deaths highlight the vulnerabilities of captive animals in extreme weather. PETA stated the lions were “born, lived, and died in confinement,” raising questions about the adequacy of zoo protocols for climate resilience. Experts warn that similar risks may extend to zoos in temperate climates like the UK.
Zoo Vows to Strengthen Protections
Tama Zoological Park has not indicated a timeline for reopening the lion exhibit. Officials emphasized that no other animals at the zoo have shown symptoms, but staff are monitoring conditions more closely. The park’s 62-year history had not previously recorded heat-related lion deaths, underscoring the unprecedented nature of this event.