Bird flu is turning up in zoos.

Dozens of rare animals including tigers, lions, and cheetahs are dying as bird flu infiltrates zoos, with potentially “grave implications” for endangered species, researchers have warned.

As a growing number of zoos report animal deaths, scientists are concerned that infected wild birds landing in enclosures could be spreading it among captive animals. In the US, a cheetah, mountain lion, Indian goose, and kookaburra were among the animals that died in Wildlife World Zoo near Phoenix, according to local media reports last week. San Francisco Zoo temporarily closed its aviaries after a wild red-shouldered hawk was found dead on its grounds, and later tested positive for highly pathogenic avian influenza (HPAIV). A rare red-breasted goose died at Woodland Park Zoo in Seattle, causing aviaries to close and penguin feeding for visitors to be suspended in November. 

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Researchers have warned for decades that this variant of bird flu could kill primates, rodents, pigs, and rabbits, with reports of Bengal tigers and clouded leopards also being killed. Infections in zoos were not unexpected, said virologist Dr Ed Hutchinson from Glasgow University. Visitors to zoos in the UK in recent years may have noticed bird enclosures being temporarily closed off or netted when the risks of infection by the H5N1 bird flu variant from wild birds were known to be high, he said. “When zoos care for animals from endangered species, taking measures to reduce the risk those animals face from H5N1, such as limiting access of wild birds to enclosures, is particularly important.”

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Bird flu viruses can be passed among a wide variety of animals. In 2020, a variant spread across the world, finally reaching the Antarctic in late 2023, causing millions of wild animals to die across Eurasia, Africa, North America, and South America on its route. In the US, it fully adapted to cattle, increasing the risk of human infections.

I did not know that. It’s not drag, so it didn’t make the headlines.

H/t Blood Knight