Butterfly fans, take a breath. I know it's officially spring and we're all pounding on nursery doors, anxious to plant some California native milkweed to help the endangered Western monarch ...

Monarch butterfly populations are endangered, to the point that the 1.2 million Western monarchs counted in 1997 plummeted to fewer than 2,000 by 2020.

The epic 3,000-mile monarch butterfly migration may become a thing of the past. Each fall, monarchs travel from their summer homes in the northern U.S. and Canada to winter habitats in California ...

And here were 14 monarch caterpillars, right in the back of my car. So I climbed into my attic and took down the screened butterfly cage I bought when I was trying everything I could think of to ...

The Fender’s blue butterfly, found in Oregon, was listed as an endangered species in 2000, which motivated conservation groups, biologists, and the U.S. Fish and Wildlife Service to come ...

Big monarch caterpillars don’t avoid toxic milkweed goo. They binge on it. The plant sap is a sticky deathtrap for young larvae. Older lab larvae guzzle it from pipettes ...