The larvae or in this case a caterpillar that hatches goes on an eating rampage. In this stage, they eat, moult and repeat that process constantly. After hatching the caterpillar is extremely hungry and eats constantly. The caterpillar eats its way out of the egg and then continues to eat plants in the outside world.

The caterpillar forms a vessel around it, called the ‘pupa’. Inside the pupa, the caterpillar gradually grows and develops. During this stage, the pupa creates skins around the vessel that makes the exterior hard. The chrysalis protects the pupa till it transforms into a butterfly and breaks out of the vessel.

The most prominent stage known to human beings is the adult stage when the Chrysalis breaks out of the vessel with colourful scaly wings. At first, these scaly wings are folded against the body of the butterfly because of its brittle nature. Once it pumps blood into the wing the butterfly flies in search of food and other butterflies to mate with. After the mating is completed, the female butterfly lays eggs on a leaf or flat surface and the whole cycle begins all over again.

The butterfly and moth develop through a process called metamorphosis. This is a Greek word that means transformation or change in shape.

Insects have two common types of metamorphosis. Grasshoppers, crickets, dragonflies, and cockroaches have incomplete metamorphosis. The young (called a nymph) usually look like small adults but without the wings.

Butterflies, moths, beetles, flies and bees have complete metamorphosis. The young (called a larva instead of a nymph) is very different from the adults. It also usually eats different types of food.

There are four stages in the metamorphosis of butterflies and moths: egg, larva, pupa, and adult.

Citheronia regalis, the regal moth or royal walnut moth, is a North American moth in the family Saturniidae. The caterpillars are called hickory horned devils. The adult (imago) has a wingspan of 3.75–6.1 in (9.5–15.5 cm). The species was first described by Johan Christian Fabricius in 1793.

Papilio glaucus, the eastern tiger swallowtail, is a species of butterfly native to eastern North America. It is one of the most familiar butterflies in the eastern United States,[3] ranging north to southern Ontario, Canada,[4] and is common in many different habitats. It flies from spring until fall, during which it produces two to three broods. Adults feed on the nectar of many species of flowers, mostly from those of the families Apocynaceae, Asteraceae, and Fabaceae. P. glaucus has a wingspan measuring 7.9 to 14 cm (3.1 to 5.5 in). The male is yellow with four black "tiger stripes" on each forewing. Females may be either yellow or black, making them dimorphic. The yellow morph is similar to the male, but with a conspicuous band of blue spots along the hindwing, while the dark morph is almost completely black.

Papilio glaucus, the eastern tiger swallowtail, is a species of butterfly native to eastern North America. It is one of the most familiar butterflies in the eastern United States,[3] ranging north to southern Ontario, Canada,[4] and is common in many different habitats. It flies from spring until fall, during which it produces two to three broods. Adults feed on the nectar of many species of flowers, mostly from those of the families Apocynaceae, Asteraceae, and Fabaceae. P. glaucus has a wingspan measuring 7.9 to 14 cm (3.1 to 5.5 in). The male is yellow with four black "tiger stripes" on each forewing. Females may be either yellow or black, making them dimorphic. The yellow morph is similar to the male, but with a conspicuous band of blue spots along the hindwing, while the dark morph is almost completely black.

Swallowtail butterflies are large, colorful butterflies in the family Papilionidae, and include over 550 species. Though the majority are tropical, members of the family inhabit every continent except Antarctica. The family includes the largest butterflies in the world, the birdwing butterflies of the genus Ornithoptera.[1]

Automeris io, the Io moth (EYE-oh) or peacock moth, is a colorful North American moth in the family Saturniidae.[5][6] The Io moth is also a member of the subfamily Hemileucinae.[7] The name Io comes from Greek mythology in which Io was a mortal lover of Zeus.[8] The Io moth ranges from the southeast corner of Manitoba and in the southern extremes of Ontario, Quebec, New Brunswick and Nova Scotia in Canada, and in the US it is found from Montana, North Dakota, South Dakota, Nebraska, Colorado, New Mexico, Texas, Utah, east of those states and down to the southern end of Florida.[9] The species was first described by Johan Christian Fabricius in 1775.

Deilephila elpenor, the elephant hawk moth or large elephant hawk moth,[2] is a moth in the family Sphingidae. Its common name is derived from the caterpillar's resemblance to an elephant's trunk.[3] It is most common in central Europe and is distributed throughout the Palearctic region.[4] It has also been introduced in British Columbia, Canada. Its distinct olive and pink colouring makes it one of the most recognisable moths in its range.[5] However, it is quite easy to confuse the elephant hawk moth with the small elephant hawk moth, a closely related species that also shares the characteristic colours.[6]