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

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

A Santa Cruz Metro driver keeps her eyes on the road as she steers her monarch-butterfly-adorned articulated rig up Heller Drive at UC Santa Cruz. The bus is one of 30 wrapped buses Metro operates ...

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.