Confirming coevolutionary theory, monarch butterfly caterpillars show impaired growth and toxin sequestration when feeding on realistic cardenolide mixtures from their milkweed host plants.

The iconic monarch butterfly is declining across North America. You can help make a difference by providing the species with its food plant: milkweed. A monarch butterfly gliding over a field on ...

The monarch butterfly is iconic in North America — but in Montana, it is a rare sight. That’s why when landscaper Kathy Ross ...

MADISON, Wis. — U.S. wildlife officials announced a decision Tuesday to extend federal protections to monarch butterflies after years of warnings from environmentalists that populations are shrinking ...

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 ...

ARVADA, Colo. — The National Wildlife Federation (NWF) said monarch butterfly populations have declined upwards of 90% in recent decades. "There’s been an impact of climate change, habitat loss [and] ...

Q: I spotted some monarch caterpillars yesterday on my common milkweed (see reader's photos). Seems late for them so I hope they will survive. A: Monarchs start migrating south from September through ...

Professor Elizabeth Crone, Department of Evolution and Ecology, checks a non-native milkweed in the San Francisco Bay Area for monarch butterfly eggs and caterpillars. Known for long-distance ...

Monarch butterflies are the iconic butterfly. It's impossible not to picture their vibrant orange and black wings fluttering through gardens or meadows when someone mentions them by name. These ...

Monarch butterflies could potentially be listed on the U.S. Fish and Wildlife Services’ list of threatened species. Officials will open a 90-day public comment period that could help determine whether ...

If you value independent local news, become a sustainer today. Your gift could help unlock a $1M challenge. In the past four months, I’ve become a loyal steward of narrow leaf milkweed. I've got other ...