Wisconsin: State wolf numbers explode

A harsh winter allowed Wisconsin's wolf pack to feast on weakened deer, sending the population surging between 16 percent and 21 percent, according to the state Department of Natural Resources.

July '08: Warming Alters Predator-Prey Balance  - The Washington Post | Encyclopedia.com

Now, scientists tracking the wolves in the world's longest- running "single predator-single prey" study fear that the Isle Royale wolves could become extinct because of global warming.