A butterfly is any of several groups of mainly day-flying insects of the order Lepidoptera, the butterflies and moths. Like other holometabolous insects, butterflies' life cycle consists of four parts, egg, larva, pupa and adult. Most species are diurnal. Butterflies have large, often brightly coloured wings, and conspicuous, fluttering flight. Butterflies comprise the true butterflies, the skippers and the moth-butterflies; all the very many other families within the Lepidoptera are referred to as moths. Butterflies exhibit polymorphism, mimicry and aposematism. Some migrate over long distances. Some butterflies have evolved symbiotic and parasitic relationships with social insects such as ants. Butterflies are important economically as agents of pollination. In addition, a few species are pests, because in their larval stages they can damage domestic crops or trees. Culturally, butterflies are a popular motif in the visual and literary arts.

butterfly - a swimming stroke in which the arms are thrown forward together out of the water while the feet kick up and down