I have seen pictures of leafcutter ants carrying off leaves. What do they do with them? Make a house?
closed as off-topic by fileunderwater, MattDMo, AliceD♦, March Ho, James Nov 5 '15 at 3:41
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As in the Wikipedia article, these ants have a mutualistic relationship with a fungus. They feed their leaves to the fungus and in return the fungus makes pellets of food to feed it to the ant larvae. Along with that, the fungus provides defense to the ants.
Ants and many other animals cannot fully digest leaves as they contain cellulose which can only be digested by certain fungi and bacteria.