I must admit, I felt very bad. I knew so little about caterpillars and butterflies. In order to fill in this shameful gap and to help Odius H., I went to the forest library.
A butterfly is an insect. Insects are by far the largest group of organisms on Earth. Scientists have discovered more than 700,000 insect species. They know many more exist, primarily in tropical regions. Insects fall into four major groups. One of them is Lepidoptera, which means "scaled winged." This group includes butterflies and moths. Dustlike scales coat the wings, bodies, and legs of moths and butterflies. That is how the group got its name. Unlike moths, butterflies usually have bright or striking colors. They are active during the day. The most distinctive features of butterflies are their antennae and the way they hold their wings up when they rest. Around 120,000 known types of Lepidoptera extend to all parts of the world.