We're away June 20–July 4, so the shop is paused — this keeps your live antlions from sitting in transit while we're out. Thanks for your patience! We reopen July 5.

How the Antlion's Pit Trap Works

June 1, 2026

The antlion's pit looks simple, but it's a small feat of engineering that uses physics to do the hunting.

Built at the angle of repose

The larva digs its pit right at the steepest angle loose sand can hold — the "angle of repose." Any steeper and the walls collapse. This means the slightest disturbance near the rim sends sand (and prey) sliding toward the bottom.

Cross-section of an antlion pit showing the ~34 degree angle of repose, the buried antlion, and prey sliding in
A cross-section of the pit — dug right at the angle of repose, so anything that slips over the rim slides straight to the waiting jaws.

The sand flick

Buried at the base with only its jaws exposed, the antlion feels the vibrations of struggling prey. It flicks sand upward to trigger miniature avalanches, knocking the victim down within reach.

Watch it yourself

Drop a small ant near the edge of your antlion's pit and watch the trap in action. For the full life story of this remarkable insect, see the antlion life cycle.