The annual migration of monarch butterflies is one of science's great mysteries: millions of monarchs know the correct path ...

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.

Monarchs traveled to a remote part of Mexico, a journey they've made for thousands of years, and wintered there. Now tens of ...

Monarchs are usually seen in Michigan from late spring to early fall.

Monarch butterflies are making their flight north after wintering in Mexico. Here's what to know about one of Earth's fascinating flyers in Michigan.

Monarch butterflies are migrating through San Antonio, laying eggs on milkweed, while other species like the Gulf fritillary ...

Journey North, which gathers reports from volunteers across the country, has been tracking the butterfly’s movement since the ...

The monarch butterfly population in the eastern United States has declined sharply — an estimated 80% loss since the 1990s. Among the factors contributing to the decline: Loss of habitat, exposure to ...

The latest official report of monarch butterflies overwintering in Mexico has just been released and offers some ...

By any measure, the revival of the bald eagle stands as one of the great environmental triumphs in conservation history. In ...

Monarch butterflies are making their flight north after wintering in Mexico. Here's what to know about the fascinating, ...

Climate change and industrial agriculture have decimated the western monarch butterfly’s crucial food source, threatening the ...