Everyone knows that squirrels bury nuts to store food over the winter and it's easy to observe this behavior in the fall. A scientist working in Wilkes University has found that when squirrels know they're being watched doing this, they will "pretend" to bury something about twenty percent of the time. It doesn't matter if the observer is another squirrel, a bird or a human either, they know they're being watched and start hiding invisible nuts:
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