Monarch butterflies are poisonous to predators because of the chemicals in the milkweed they eat as caterpillars. In just the 9 to 14 days of the larval stage, a monarch caterpillar can grow to 2,700 ...

A monarch butterfly gliding over a field on outstretched ... and removes evidence that predators might use to find the caterpillar). From then on the caterpillar only eats the leaves of the ...

That cost may be worth it for monarch butterflies because the benefit of being noxious to predators is so much more valuable, Whiteman says. Tina Hesman Saey is the senior staff writer and reports ...

The Trump administration said Tuesday that it is reconsidering adding protections to the monarch butterfly as a threatened species under the Endangered Species Act. The U.S. Fish and Wildlife ...

Monarch butterflies have been spotted in south Georgia. See when you can expect them further north and check out some tips to ...

In a turn of events, the eastern monarch butterfly population — which was put on the list of endangered species just a few years ago — nearly doubled this year, according to a March report ...

The monarch butterfly population has declined in recent decades, leading to a proposed listing as threatened under the Endangered Species Act. People can help monarch butterflies by planting ...

Some words may be mispronounced. The number of monarch butterflies that spent the winter in Mexico doubled this year, giving hope for a species that has faced decline in recent decades.