Clever Tricks: Smart Birds

Now if you were just a tiny little creature and you came to a tall glass that you couldn't pick up and there was water in it that you wanted to drink but it was too low to reach, what would you do? There is an Aesop Fable about this and the bird that drops the rocks in until water rises, but if a picture is worth a 1000 words, then this video tells quite a bit.