Clark’s Nutcrackers use prodigious memory. Really think of what they can remember, that is, cache locations from two years, that is 20,000 locations. However, each of these locations has a number of aspects that have to be remembered as well: 1) every cache that still has seeds and which ones do not; 2) overflight visual recognition of the general location of all 20,000; 3) the landscape features they are using for triangulation for all 20,000—that is 40,000 landscape features; 4) the exact spot on the landscape feature from which to measure—40,000 of them; 5) the distance from feature
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