Climate warming can impact plant quality, which in turn shapes the nutrition and immune defense of insect herbivores like monarch butterflies.

Photo Caption: This is one of a dozen winter monarch butterflies that were raised from larvae found by Bob Pish shortly before Christmas. Photograph by Bob Pish. During the 12 years this column has ...

Butterflies sit on a pine tree at Monarch Grove Sanctuary in Pacific Grove, Calif. Researchers say that the population of western monarch butterflies is well below what it used to be. One of the most ...

Retired schoolteacher Tachi Dellinger pointed inside a mesh box, where three green chrysalises hung. “This one is starting to change color,” Dellinger said. “It will turn jet black ... when it's ready ...

It’s hard to imagine a more vigorous advocate for the endangered monarch butterfly than Rick Mikula. Known around Hazleton as the butterfly guy, Mikula has spent his adult life teaching about ...