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Squirrels
Squirrels are not only quick-witted, but also able to crank up pretty tricky schemes. For example, if you once fed a squirrel, then it is likely that the next day it will come back to you again and will gladly accept a handful of goodies. The squirrels can repeat these actions indefinitely, because everything that she fails to eat at one time, she will carefully save in her «secret».
