When monarch butterflies are laying low down south for the winter, a temperature-sensitive timer preps them for the trip north.

New findings suggest captive breeding isn't a good way for fans of monarch butterflies to help the species.

"Getting accurate monarch counts in the summer is tough. Finding them in the fall, though, is nearly impossible as they're moving hundreds of miles daily."

Air reaches cells inside caterpillars' bodies in a very direct way. Could they be a way to monitor haze?

Anyone with milkweed in their yard can help monarch butterflies just by mowing their lawn at the right time.

When apart from the bug it mimics, the normally tasty viceroy butterfly turns sour. The discovery made biologists rethink old theories about animal mimicry.

Male butterflies have genes which give them a sexual preference for a partner with a similar appearance to themselves, according to new research.

Many butteflies use their wings to mimic other species to protect themselves from predators. Now, a new study shows how just one gene is key to their color.