Dozens of Idaho Department of Fish and Game workers and volunteers at the weekend retrieved and incinerated carcasses of snow geese found near bodies of water and a wildlife management area in the eastern part of the state, said agency spokesman Gregg Losinski.

Avian cholera is believed to be the culprit in the deaths mostly because of the way the birds died, he said.

"Basically, they just fell out of the sky," said Losinski.

He said biologists were awaiting results from a state wildlife lab to confirm the birds died of the highly contagious disease, which is caused by bacteria that can survive in soil and water for up to four months.