Colony estimates at central Mexico overwintering sites indicate that monarch butterfly (Danaus plexippus) populations have declined over the past two decades. Among the leading causes of this ...

In the Yukon, Porcupine caribou travel 3,000 miles. This is the longest migration by land of any mammal on Earth. Monarch butterflies fly about 3,000 miles each year. Some will travel all the way ...

Monarch butterflies are important culturally and ecologically across North America. Generations have watched in wonder as yellow-and-black striped caterpillars fold into green-and-gold chrysalises and ...

The major U.S. Fish and Wildlife Service’s proposal would declare the iconic species as threatened, with federal scientists ...

Monarch butterflies are important culturally and ecologically across North America. Generations have watched in wonder as yellow-and-black striped caterpillars fold into green-and-gold chrysalises and ...

This winter, volunteers from the Xerces Society, a nonprofit environmental group, tallied just 9,119 western monarchs — a ...

A monarch butterfly feeds at Cape May Point State Park in Lower Township, N.J., Wednesday, Oct. 14, 2020.Get Photo Monarch butterflies roost as the sun begins to set at The Nature Conservancy's ...

Just over 9,000 monarchs were counted in California last winter, the second lowest ever since the annual count began in 1997 ...

The number of monarch butterflies spending the winter in the western United States dropped dramatically this year even as ...