leaf-cutter ant

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Any of several fungus-growing ants of the genera Acromyrmex and Atta that cut pieces of leaves, bring them back to the nest, and use them as the substrate for fungus gardens in which they cultivate fungi for food.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun Any of the 41 species of ants in the genera Atta and Acromyrmex, that cut fragments from leaves and takes them to its colony's nest.