Forcing blood into the tube straightens it out,allowing butterflies to feed on liquids. Butterflies get all their food from this tube, which limits them to nectar and standing water. Larvae, on the other hand, have chewing mouth parts which they use to skeletonize or totally defoliate leaves. Butterflies have large, rounded compound eyes which allows them to see in all directions without turning their head. Like most insects, butterflies are very nearsighted, and are more attracted to large stands of a particular flower than those planted singly.
Butterflies also have a very well-developed sense of smell from their antennae.
All butterflies' antennae are club-shaped, as opposed to moths, which can be many shapes but often are feathery. Butterflies begin their life as an egg, laid either singly or in clusters depending on the species. A very tiny caterpillar emerges and, after consuming its egg shell, begins feeding on its host plant. Caterpillars must crawl out of their skin or molt, usually around five times, before changing into a pupa. Finally, an adult butterfly emerges, spreads its wings and flies away.