The science of entomology is the study of insects, a group
of animals which are invertebrates. Invertebrates have no backbone. However,
insects can be distinguished from other invertebrates by their having
three body parts (head, thorax and abdomen), six-legs, antennae, compound
eyes and a hard outer casing made of chitin. Most insects have wings in
some form, occasionally vestigial in nature, but some of the more advanced
insects, which have evolved social living, have casts which have no wings
at all (i.e. workers).
