LOS ANGELES, Nov. 13 (UPI) -- Today's Great Lakes gray wolf, de-listed by U.S. officials as an endangered species, probably is a hybrid and no longer the historic animal, biologists said.

HOUGHTON, Mich., Oct. 17 (UPI) -- U.S. scientists are preparing to celebrate 50 years of studying the interaction of wolves and moose at Isle Royale National Park in Michigan.

ISLE ROYALE NATIONAL PARK, Mich., March 5 (UPI) -- U.S. researchers said Friday global warming might be responsible for upsetting the balance among wolf and moose populations at Isle Royale National Park.