Alpine chipmunk, trees moving to higher altitudes as climate changes
YOSEMITE NATIONAL PARK, Calif. — High above a silver-blue mountain lake, a gray-bearded man tromped up a rocky slope and peered at a small metal trap. It was empty.
He kept moving, scrambling across huge granite boulders and found another trap. This time, success: "We got something,” he said.
Jim Patton , a retired professor of zoology at the University of California-Berkeley , had his quarry: the tiny, as...
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