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How Many Cache Locations Can A Bird Remember?

Scientists at the University of New Hampshire hope to learn more about
memory and its evolution by studying the Clark's nutcracker, a bird with a
particularly challenging task: remembering where it buried its supply of
food for winter in a 15-mile area. Like many animals preparing for the
winter, every fall the Clark's nutcracker spends several weeks gathering
food stores. What makes it unique is that it harvests more than 30,000
pine nuts, buries them in up to 5,000 caches, and then relies almost
solely on its memory of where those caches are located to survive through