• Three female lions have died at Tama Zoological Park due to suspected heat-related illness.
• Japan faces its hottest summer on record, with temperatures exceeding 40°C.
• Zoo officials are treating other lions while implementing new heat countermeasures.

Three female lions at Tokyo’s Tama Zoological Park have died from suspected heat-related illness during a record-breaking summer in Japan, where temperatures have soared above 40°C, qualifying for the designation of "cruelly hot day." The pets succumbed to dehydration and multiple organ failure, prompting the zoo to suspend its lion exhibit due to severe health impacts on the remaining animals, which have also shown symptoms of heat stress, according to BBC.

Since mid-July, multiple lions have exhibited "loss of appetite and decreased activity" as extreme weather conditions significantly impact their health. The zoo has reported that three lionesses died within a week, with the last one passing on August 1. The sudden rise in temperatures was noted to follow an unusually chilly rainy season in late July, which left the animals unprepared for such heat, according to Channel News Asia and South China Morning Post.

Zoo representatives are enacting enhanced measures, such as improving ventilation and installing portable air conditioners, to protect the remaining lions. According to a zoo spokesperson, the heat in Japan poses unique challenges unrelated to the dry heat experienced in Africa, complicating the animals' natural ability to cope with high temperatures. Experts have indicated that high humidity can prevent lions from effectively cooling themselves, exacerbating their risk of heat-related illnesses, as noted by BBC and Channel News Asia.

During the same period, the Japanese government has reported that nearly 18,600 individuals were hospitalized for heatstroke, underlining the broader health crisis stemming from extreme weather. The government aims to reduce annual heat-related deaths, which currently average around 1,300, by adjusting public health strategies and responses, according to South China Morning Post.