The largest butterfly in the world is the Queen Alexandra's Birdwing butterfly (Ornithoptera alexandrae), from the island of New Guinea, which can reach a wingspan of up to 12 1/2 inches (32 centimeters). The male is significantly smaller than the female.
Unlike many other insects, butterflies do not go through a nymph stage. Instead, they undergo a pupal stage during which they transform from caterpillar to butterfly. The four stages in the lifecycle of the butterfly are: 1) Egg, 2) Larva (caterpillar), 3) Pupa (chrysalis), 4) Imago (butterfly).
Butterflies taste with their feet. They don't have mouths that allow them to bite or chew, instead they have a long straw-like structure called a proboscis which they use to drink nectar. But the proboscis doesn't have any taste sensors. A butterfly's taste sensors are located on the bottom of its feet. By standing on a leaf, the butterfly can taste it to see if it will be good food for her caterpillars.