Butterfly

Cold in the Mexico mountaintops prompts migrant monarchs to fly north.

Researchers have documented 51 different butterfly species at the U.S. military base at Guantanamo Bay.

Butterfly populations in Massachusetts have shifted north over the past two decades, likely in response to climate change.

From deformed wings and eyes to infertility, radiation has wreaked havoc on these insects.

A lifetime of research points to changes in butterfly populations due to a warming climate.

The brown argus butterfly has expanded its range rapidly in recent years.

Butterflies are promiscuous with large regions of their genomes, spreading traits to different species.

These coastal insects are critically endangered.

European butterflies are stuck between a shady and a hot place.

From striking Monarchs to iridescent morpho butterflies, here's a look at some butterfly beauties.