Add Yahoo as a preferred source to see more of our stories on Google. We have been encouraging our backyard milkweed to grow ever since we moved over five years ago. I have friends who have issues ...

The monarch butterfly life cycle begins with a whirl of wings in the heat of the summer sun. As a female monarch sips nectar from a wildflower, a male hovers nearby. A pheromone is released from tiny ...

It usually takes just two to three days for them to build up their strength.

Every fall, monarch butterflies fuel up on nectar from Iowa’s fall-blooming wildflowers before embarking on an extraordinary ...

I saw a large monarch caterpillar crawling up my wooden fence, but I haven’t planted any milkweed. There is a fallow field nearby, though, so maybe it has some. I left the caterpillar alone, but ...

Monarch butterflies, with their striking orange and black wings, are some of the most recognizable butterflies in North America. But they're in trouble. Monarch caterpillars can only eat the leaves of ...

A trio of German entomologists has found that young monarch caterpillars switch from avoiding milkweed-toxin-rich latex to eating it as they get older. Their paper is published in the journal ...

Every fall, millions of monarch butterflies set off on a journey spanning thousands of miles—and several generations. Where ...

Southern California residents were encouraged on Wednesday to report sightings of western monarch butterflies as part of an effort to help scientists track the species’ sharply declining population ...