Monarch butterfly numbers are down by 80% overall and remain just one-third the size needed to avoid migratory collapse.

Monarch butterflies are making their annual journey north out of Mexico to their summer breeding grounds. See where they've been spotted in Oklahoma.

When is peak monarch butterfly migration in Texas? Monarch butterflies are beginning their journey to central and southern Texas, traveling primarily along cities near the I-35 Corridor.

Sightings of monarch butterflies have been seen predominantly near southern cities like Savannah and St. Mary's, according to Journey North's interactive migration map. Here's what we know: ...

Gregory Bull/AP, File FILE – This Aug. 19, 2015, file photo, shows a monarch butterfly in Vista, Calif. The number of western monarch butterflies wintering along the California coast has ...

Following a migration that started in Mexico, monarch butterflies have reached Michigan. Here's where they've been spotted.

For thousands of years, millions of monarch butterflies have migrated from the northern U.S. and Canada to Mexico for the winter. But exactly how they know where to go is still a mystery.

Monarch butterflies have begun fluttering across Michigan after a migration that began in Mexico. The brightly colored insects have been reported in southeast Michigan, migration watchers say.

Monarch butterflies are returning to Michigan for the summer after migrating from Mexico. Michiganders can support monarch butterflies by planting milkweed, tracking sightings, and donating to ...