All insects belong to the phylum Arthropoda. But unlike other arthropods—like lobsters, spiders, or millipedes—insects have three pairs of jointed legs, segmented bodies, an exoskeleton ...

like spiders or centipedes … even though they are not insects at all! Insect body parts have names a lot like ours — the head, thorax (chest), and abdomen. But insects are also very different from us ...

Insects are the largest group of all living things, containing more than a million identified species (compared with 240,000 flowering plants and 4,500 mammals). They can be found in all habitats ...