Before National Geographic published its famous August 1976 cover story detailing the search for the monarch butterfly’s wintering grounds, nobody knew where these strikingly beautiful creatures ...

The number of monarch butterflies in California is in sharp decline this year, and biologists say record-high late summer temperatures and drought in the west likely contributed to the dropoff.

The number of monarch butterflies spending the winter in the western United States has dropped to its second-lowest mark in nearly three decades as pesticides, diminishing habitat and climate ...

For the past three years, more than 200,000 western monarch butterflies spent their winters along the California coast — huddling together in tall tree groves, finding respite from the wind from ...

ST. LOUIS COUNTY, Mo. – Say the word “butterfly,” and the iconic orange and black of the monarch may immediately spring to mind. But they are becoming a rarer and rarer sight in nature.

Monarch butterflies—including western monarchs, who winter in California and spend summers west of the Rockies—were recently proposed for listing as threatened under the Endangered Species Act.