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This is Scientific Americans, 60-second science. I'm Steve Merski.

We humans sometimes use a memory technique called chunking.

For example, with phone numbers, we usually remember the three-digit chunk and the four-digit chunk, two items instead of seven.

Well, the way I think about chunking is it's any short-cutting strategy or

mnemonic device that would allow an animal, be it human or otherwise, to increase their

memory capacity and improve recall. Michael Delgado, an animal behaviorist now at UC Davis.

And so in the case of the research I was doing in this study, I wanted to know if squirrels

would basically arrange their nuts in a way that might facilitate either recall of the location

or recashing and redistribution of those nuts later, like making it more convenient for them

to remember where

nuts were stored because they stored nuts of a similar type or value in similar locations

spatially. Delgado looked for this spatial chunking among 45 fox squirrels on the campus of

UC Berkeley, where she got her doctorate in August. So we gave each squirrel 16 nuts for each of four different types.

So the types were almonds, hazelnuts, walnuts, and pecans.

And so we'd give the squirrel the first nut.

They'd go bury it.

We would follow them from a distance until they had finished caching or burying it.

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