The mystery illness that has killed 27 bald eagles in Utah this month appears to be West Nile Virus, state officials said Tuesday.
The Utah Division of Wildlife Resources said in a statement that laboratory tests done on some of the first birds found indicate they died from West Nile Virus.
Since Dec. 1, officials have found the birds in northern and central Utah. All were either dead or were ill and later died during treatment.
The eagles displayed similar symptoms, including head tremors, signs of seizures, weakness in legs and feet and a paralysis of the bird's wings.