MARTINEZ, Calif. (KGO) -- Researchers are trying to figure out why young beavers are dying in a Martinez creek.
Three of four baby beavers born this year in Alhambra Creek have unexpectedly died. Officials say a fourth dead beaver was spotted floating in the water this week.
Scientists say they did not find anything out of the ordinary after a necropsy on a baby beaver last month.
Veterinarians have ruled out the drought and algae related toxins.
Five beavers currently live in the creek.
Researchers puzzled over beaver deaths at Martinez creek

This undated photo shows a beaver swimming in Alhambra Creek in Martinez, Calif. (KGO-TV)