Call for additional precautions as captive species including lions, tigers and cheetahs are killed by virus

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. These cases follow the deaths of 47 tigers, three lions, and a panther in zoos across south Vietnam over the summer.