Insects

The insects are one of the groups animal that have obtained major evolutionary success in our planet. They occupy practically the totality of the terrestrial existing habitats, being complementary in firm land to the crustaceans.The insects, or hexápodos, have the body divided in three regions: head (with antennas, jaws, maxillary and lips), thorax (with three couples of legs, two couples of wings and two couples of espiráculos). They have eyes simple and composed in the head, excrete by means of Malpighi's pipes and the fertilization is internal. In the development they happen for several larval phases. Almost they all are terrestrial and in a secondary way some of them live in the waters, in general continental and in an exceptional way in the sea.

Numerous insects happen for different larval phases before reaching the adult condition. A caterpillar of butterfly appears here.