A large family of light or brightly coloured butterflies of medium size, containing some of the few species regarded as pests by gardeners and vegetable growers. Skittle-shaped eggs, laid either singly or in clusters, give rise to voracious, usually green caterpillars which feed aggressively on vegetable matter. Containing unpleasant chemicals to deter predators, those larvae that survive form chrysalises with pointed or beak-shaped heads held by a silken pad and girdle, varying in colour according to the background on which they are formed. .