Abdomen - the hind part of the body on the caterpillar and the butterfly. All insects have one!

Antennae - found on the butterfly's head, used to taste the air, and help with balance and orientation.

Caterpillar - the larval stage of a butterfly or moth.

Chrysalis - the hard shell covering the pupa, shaped like an upside-down teardrop.

Compound eyes - found on the butterfly's head. Thousands of tiny lenses help the butterfly see in all directions, and recognize color and pattern and movement.

Proboscis - the butterfly tongue, which works like a drinking straw. In metamorphosis, the proboscis is formed as two separate parts, which the butterfly uncoils and zips together to form a tube for drinking.

Thorax - the three front segments of the caterpillar, each segment with a pair of legs. The front part of the butterfly's body.

Larva - the second stage of metamorphosis - another term for caterpillar.

Mandible - the caterpillar's jaw.

Ocelli - name for the three sets of eyes your caterpillar has. The caterpillar's vision is poor even with all those eyes!

Palpi - feelers that help the caterpillar "see" where it's going - also found on the butterfly's head.

Pro-legs - found on segments 3 through 8, and the last segment, of a caterpillar.

Pupa - the third stage of metamorphosis - another name for the chrysalis.

Spinneret - opening of the silk gland, found on the caterpillar's lower lip. It's used to create the silk pad to which the chrysalis attaches.

Spiracles - breathing holes. Found in pairs - one on each side of all segments of the caterpillar except the second, third, and the last. Spiracles are also found on the chrysalis and butterfly.

Cremaster - replaces the anal-claspers in attaching the chrysalis to the top of the cup or to a twig.

Crochets - groups of hooks on the caterpillar's prolegs.

Cuticle - the skin or exoskeleton of the caterpillar and chrysalis. The Painted Lady caterpillars' cuticle has short spines. These spines are a defense from predators.

Exuvia - the name for the molted, caterpillar cuticle. Look for it in the bottom of the cup!

Entomologist - scientist who studies insects.

Frass - caterpillar excrement (those little round balls at the bottom of the cup).

Habitat - environment that supports the survival of a species.

Lepidopterist - scientist who studies butterflies.

Metamorphosis - the process of developmental changing from one thing into another, often marked by body changes.

Migrate - to travel from one place to another, often seasonally.

Molt - the caterpillars "molt," or shed their skin, as they grow.

Nocturnal - active at night.

Pheromones - special chemicals the butterflies give off to attract a mate.

Puddling - butterflies gather, or puddle, at damp spots. They are getting sodium, an essential part of their diet.