アリジゴクは砂が崩れないギリギリ傾斜「安息角」を作ります。たくさんアリジゴクが集まると、砂上の模様になるかも。

An antlion constructs its pit at the angle of repose—the steepest slope at which the sand remains stable. When many antlions gather, they may form patterns on the sand.