The University of Minnesota Raptor Center has euthanized a second eagle this hunting season because of lead poisoning.

The Raptor Center says it sees lead poisoning cases annually beginning with deer hunting season and lead bullets are the main cause. The birds scavenge on an animal that’s been shot and wind up eating lead too.

Five more eagles were admitted to the Raptor Center this season in which lead was a secondary problem.

The center’s executive director, Julia Ponder, says they are not anti-hunting, but notes that copper ammunition is an alternative to lead.