Researchers find evidence of gene flow from parasitoid wasps to the butterflies and moths they lay eggs in.

Several recent studies point to serious—and mysterious—declines in butterfly numbers across the globe.

What researchers are learning as they sequence, map, and decode species’ genomes

What researchers are learning as they sequence, map, and decode species’ genomes

What researchers are learning as they sequence, map, and decode species’ genomes

A butterfly’s varied disguises are controlled by variants of a single gene, partially confirming—and refuting—a decades-old hypothesis.

A round-up of recent discoveries in behavior research

Three-dimensional imaging of living chrysalises shows how butterflies develop.

The Psyche (Leptosia nina) butterfly, shown here as a mating pair, is a weak flyer, making erratic movements as it bobs across the grass and rarely leaving ground level.

Researchers have found an increase in butterflies with unusual wing shapes, legs, and antennae than before the nuclear disaster.