An annual count of monarch butterflies conducted by the United States and Mexico as the insects migrate back and forth over ...

A newly released survey of the eastern monarch’s 2025-26 winter population in Mexico showed a 64% increase over 2024-25.

A first look at new research from the forests of central Mexico.

Suitable milkweed habitat in Mexico may shift south, fracturing existing migration routes and possibly pushing some ...

The California State Parks Foundation is asking Californians to track sightings of western monarch butterflies to help save the dwindling insect population. The California State Parks Foundation, a ...

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 change ...

Add Yahoo as a preferred source to see more of our stories on Google. Monarch butterflies have begun fluttering across Michigan after a migration that began in Mexico. The brightly colored insects ...

UC Master Gardeners helped transform a neglected site by a freeway offramp in Atascadero into a rest stop for migrating monarch butterflies.

A daring surgical procedure has given a doomed monarch butterfly a new lease of life. The delicate operation was captured on ...

MONARCH This is a recent photo of the now-rare monarch butterfly, submitted with location by a local hiker to the citizen-scientist app, iNaturalist. The app crowdsources observations of wild nature ...