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Lion Ants
Since it preys primarily on ants, the antlion is, metaphorically speaking, a "lion" among ants.
The larvae of some antlion species hide under bits of debris or wood and attack passing insects.
In sandy regions, some species dig a shallow cone-shaped pit and wait at the bottom for an ant or other insect to slip on the loose sand and fall in, only to be immediately devoured. These pit-digging antlions are called "doodlebugs" in the United States because of the designs they make in the sand. As a doodlebug seeks an ideal location to dig its pit, it leaves meandering trails that resemble the random "doodles" . When it finally finds the right place to dig, the doodlebug "draws" a series of concentric spirals, each deeper than the last, until the pit is excavated.
Adult antlions resemble dragonflies or damselflies (order Odonata) and, like damselflies, they are feeble flyers. The adult is seldom seen in the wild because it is active only in the evening; during the day it rests, motionless, well-camouflaged by its transparent wings and dusk body (Grzimek 1979, 224).
Fully developed larvae are as long as a human fingernail—about 1.5 cm. Adults are approximately 4 cm long and have a wingspan of 8 cm.
Of the documented relationships between antlions and other animals, perhaps the most interesting is the relationship in which antlion larvae serve as hosts to parasitic insects. For example, the larvae of the Australian horsefly Scaptia muscula live inside antlion larvae pits, where they share the spoils of the antlions' trapping abilities
Antlions are often included in lists of beneficial insects, no doubt because they prey upon ants, a common pest to humans.
Information collected from the following websites:
http://www.antlionpit.com/what.html
http://en.wikipedia.org/wiki/Antlion
http://ant.edb.miyakyo-u.ac.jp/BE/Kingdom/5253/5253e.html
http://www.sciencechannel.com/tv-shows/monster-bug-wars/videos/monster-bug-wars-trap-jaw-vs-ant-lion.htm