Caterpillar — the larva of insects of the order Lepidoptera (butterflies).
The body consists of a head, three thoracic and ten abdominal segments. Head with powerfully sclerotized covers, the rest of the body in most soft, without large sclerites. On the body well developed setae, located in a specific way, specific to individual families, genera and even species. In addition to these primary setae at older ages, many are openly living forms develops a dense covering of secondary setae (the most powerful caterpillars representatives of family of bears). Body size from a few millimeters (the number of moles) of 12 cm.