To avoid its natural enemies, a leaf roller moth larva will roll a leaf up in the silk it spins, forming a tube open on both ends; the leaf provides both shelter and food for the larva.
捲葉蛾的幼蟲（以下簡稱捲葉蟲），為了躲避天敵，會吐絲捲起葉片，像個兩端開口的長筒子；這葉苞不但是避難所，也是牠們的食物。