UNIVERSITY PARK, Pa., May 3 (UPI) -- Global warming may be the reason for a decrease in the number of caribou calves being born in West Greenland, U.S. researchers said.

SANTA CRUZ, Calif., April 17 (UPI) -- U.S. researchers have determined climate change can cause "boom and bust" population cycles that make animal species more vulnerable to extinction.

Researchers braving Greenland's frigid temperatures and tempestuous snowstorms have collected the first direct evidence that a change in the wind can alter identically the fate of diverse animal species living vast distances apart.