An international collaboration to track individual monarchs kicked off this fall, including James Madison University.

This important study shows that different forms and mixtures of cardenolide toxins in tropical milkweed, especially nitrogen- and sulfur-containing types, change how monarch caterpillars eat, grow, ...

Students at K.O. Knudson Middle School have successfully convinced Las Vegas Mayor Shelley Berkley to sign the Mayor's ...

Van der Heide got her start at Cal Poly, tagging monarchs by numbering their wings in Sharpie and trying to find them later ...

For the first time in California, citizen scientists can join the effort to track monarch butterflies thanks to Blu+, a new ...

For the first time in California, citizen scientists can join the effort to track monarch butterflies thanks to Blu+, a new ...

A video filmed in Florida, USA on June 25, 2024 shows a monarch butterfly undergoing a careful wing repair using a donor wing, allowing it to recover and fly normally again. Canadian petition targets ...

Autonomous electric tractor startup Monarch Tractor warned staff Thursday it may need to lay off more than 100 employees, or possibly even “shut down,” according to a company-wide memo obtained by ...

This story is part of our November 2025 issue. To read the print version, click here. This story is part of our November 2025 issue. To read the print version, click here. The monarch butterfly window ...

Scientists used tiny new sensors to follow the insects on journeys that take thousands of miles to their winter colonies in Mexico. Scientists used tiny new sensors to follow the insects on journeys ...

A total of 500 butterflies were tagged with BluMorpho transmitters and released from different areas of the United States and Canada in late September. (@correorealmx/X) The first monarch butterflies ...