Biodiversity Works

Over 20 partner organizations, including the Monarch Joint Venture, came together to deploy over 400 transmitters on migrating monarchs during fall 2025 for Project Monarch, a collaborative effort founded by Cellular Tracking Technologies and the Cape May Point Arts & Science Center.

The project has shattered previous limitations in butterfly tracking, providing scientists with high-resolution, near-real-time data on individual butterflies as they navigate their incredible fall journey.

Tagged monarchs have been tracked from the Rocky Mountains to the East Coast on their travels down to Florida, Mexico, and the Caribbean. As of Nov. 9, some tagged monarchs started reaching overwintering areas in Mexico.

Take a look at the map of this year's tagged monarchs here, or download the Project Monarch app to view individual monarchs' migration routes.

For more information on this collaborative effort, as well as a recent New York Times feature story, check the comments.