The ant-lion is a very interesting little creature about a quarter of an inch long, whose principal occupation, as the name suggests, is the trapping of ants. It chooses a patch of soft sand on which to build the trap and then buries itself in it. By maneuvering underneath the sand the ant-lion forms an imitation ant-hill with a hole through the center. When the ant passes across the hill the sand slips beneath his feet and the more he struggles the deeper he goes until the ant-lion feels the pang of hunger which prompts him to reach through the sand and make sure of his prey.
Moving Picture World synopsis