Evolution: Fossils reveal butterflies' history

The world’s largest butterfly tree of life is helping researchers determine where the winged insects originated when they first appeared on Earth about 100 million years ago.

Tools of the trade: MicroCT reveals native structure and functional morphology of organs that drive caterpillar–ant interactions

Fossils reveal butterfly 'tree of life' and origins

Insects, Free Full-Text

DNA analysis reveals butterfly and moth evolutionary relationship

Lepidoptera - Wikipedia

A Powder snow Butterfly

Butterfly Life Cycle – For Educators

Evolutionary history of butterflies and moths

New Research Reveals New Origins for Butterflies, Blog, Nature

Butterfly Fossils -Crystalinks

All butterflies evolved from ancient moths in North America 100 million years ago

What Butterflies' Colorful Wing Patterns Can Teach Us About Evolution, At the Smithsonian