bug life cycle

Many insects undergo complete metamorphosis consisting of four stages: egg, larva, pupa, and adult.

Durations vary widely by species: eggs or early larval emergence can occur within a few days (commonly 2–14 days), pupal stages may last about a week to several weeks, larval development can take months or even several years in some beetles, and adult lifespans range from months to years depending on the species.

Insects place eggs where young will encounter food or shelter: on host plants (often near prey), on or under tree bark, inside decaying wood, in soil chambers near food sources, or in nests built in hollow trees, cavities, or underground.

A fertilized queen typically founds the nest and feeds the first brood herself; once those workers mature they take over nest building, foraging, and defense, allowing the queen to focus on laying eggs.

Adult lifespans vary widely by species: some beetles are noted to live about 1–2 years, many adults live months to years, and certain social insect queens can live for decades (one species' queen is reported to live up to about 30 years); some adults also extend survival by overwintering.

Illustrated field guides and species-focused books that show life-stage photos (for example, caterpillar and insect guides) are helpful, as are educational models—such as hand-painted rubber sets—that depict the four-stage life cycle for classroom teaching and display.