Butterfly

The monarch butterfly, once common across the United States, could soon end up on the Endangered Species List.

To stop identity thieves and counterfeiters, a group of researchers is looking for inspiration from an unlikely source: butterflies.

A mysterious butterfly-shaped cloud spotted over St. Louis last week was built from actual butterflies.

Two new butterfly species have been discovered in the U.S. — an unusual finding made by examining DNA.

Here are some photos of butterflies drinking turtle tears in the western Amazon, where the insects flock to the reptiles to ingest the sodium from their eye secretions.

It's odd for truly distinct butterfly species to be identified in the United States today.

Using a CT scanner, researchers have revealed the transformation from caterpillar to butterfly in stunning detail

Using a CT scanner, researchers have captured gorgeous, 3D images of caterpillars undergoing metamorphosis

Butterflies face much more bumpy, turbulent skies than previously thought.