NEW HAVEN, Mich. (AP) —

State conservation officers are investigating the deaths of two trumpeter swans found fatally shot at a state park in southeastern Michigan. 

Conservation officers found the carcasses of an adult trumpeter swan and a young trumpeter swan at Wetzel State Park in Macomb County. 

Officials with the Michigan Department of Natural Resources said Friday the birds, which are a threatened species in Michigan and illegal to hunt, had multiple gunshot wounds. 

The Detroit Free Press reports the birds appear to have been shot a week ago while trying to land on a pond at the park. 

Trumpeter swans are North America's largest native waterfowl.