August 4, 2026 / 6:53 AM EDT

/ CBS/AFP

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Three lions at a Tokyo zoo have died from suspected heatstroke and others are under treatment, a spokeswoman said on Tuesday, with the big cats struggling with high humidity. Japan sweltered through its hottest summer on record last year and parts of the country have hit 40 degrees Celsius in recent weeks, qualifying for the new designation "cruelly hot day," with thousands of people hospitalized. Ten of the 16 lions in Tama Zoological Park have suffered symptoms such as "loss of appetite and decreased activity" since mid-July, and three lionesses died, the zoo said in a statement. One 3-year-old female named Mugi died on Tuesday. Three days later, an 11-year-old female named Ichigo died and on Sunday, a 15-year-old female named Luena died.

Mugi is pictured on May 28, 2025.