Saturday, August 8, 2026 - All four Humboldt penguins kept at Yagiyama Zoological Park in Sendai, northeastern Japan, have died after testing positive for avian malaria, a mosquito-borne disease that can kill birds rapidly.
The penguins died one after another between July 9 and July 19, with none showing clear signs of illness until shortly before their deaths. An investigation commissioned by the zoo and carried out by Iwate University confirmed avian malaria as the cause, leaving the facility without its penguin group.
The sudden losses have raised immediate concerns about how mosquitoes are entering and breeding around the enclosure. Avian malaria does not infect humans, but it can be particularly dangerous to birds when symptoms appear late and the disease progresses quickly.
Zoo officials are now examining the environment around the enclosure, with plans to eliminate standing water and redesign areas where mosquitoes could breed before considering bringing new penguins to the facility.
The incident highlights a growing challenge for zoos that keep birds in environments where mosquito populations can thrive. Humboldt penguins are native to the coasts of Peru and Chile and are commonly kept in Japanese zoos because they tolerate warmer conditions better than Antarctic species.
For Yagiyama Zoological Park, the priority now is preventing another outbreak and ensuring that any future penguins can be housed under safer conditions before the exhibit eventually reopens.
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