BOISE, Idaho - Idaho officials say six juvenile wolves were found decomposing on U.S. Forest Service land.
Officials at the Idaho Department of Fish and Game hadn't determined what killed the 35-pound wolves, but they've sent tissue samples to an Oregon laboratory to be analyzed.
Jon Heggen, head of Fish and Game enforcement, says it could be several days before test results are available.
There were no outward signs of injuries or bullet wounds. Heggen says viruses like parvo have also been ruled out.
The animals were found last Friday in various stages of decomposition.