The caterpillar, or larval, stage of a butterfly or moth is the only stage in which the insect has chewing mouth parts. Hence, it is the stage during which a great deal of eating takes place. As the caterpillar eats, it grows larger, and eventually molts its skin, revealing a new, larger skin underneath the old. A cecropia caterpillar molts four times before spinning its cocoon and pupating. The cecropia caterpillar in this photograph has just molted its skin, which is attached to the plant just above the caterpillar’s head. If you look closely, you can see where the colored tubercles were. Within an hour of when this photograph was taken, the caterpillar had eaten its skin.