Wow Plants

Animals are cool, but plants do pretty awesome things sometimes too. This plant hides when you touch it. Check it out:

(Excuse the dirty fingernails, this was after a day in the mud.) Its name is Mimosa pudica and it is in the legume family (Fabaceae). The movement happens when cells lose turgor pressure (basically water pushing against cell walls). It may be a defense mechanism against things that eat the plant.