A new report shows wolves on Isle Royale have taken a sudden turn towards extinction.
For half-a-century, scientists have studied the predator-prey behavior of wolves and moose on the island. It's the longest running wildlife study in the world.
The National Park Service manages Isle Royale as a wilderness, with a hand-off policy of not intervening. But some researchers say if the wolves die out, the moose will radically change the island's ecology.
IPR's Bob Allen talks with Biologist Rolf Peterson of Michigan Tech University, who's been studying the animals on Isle Royale for more than forty years. He's co-author of a paper that lays out the positions for and against intervening to replace wolves on Isle Royale should they go extinct.