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).
Speckled Wood Butterfly 

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