Every year, the World Wildlife Fund Mexico partners with other conservation groups and local citizens to conduct a count of eastern monarch butterflies in their winter home, the Monarch Butterfly ...

A total of 160 monarchs across Mexico’s six butterfly sanctuaries have been tagged with new transmitters that will provide the most detailed look to date at the first leg of the the insects' migration ...

Monarch butterflies from the western United States have arrived in Santa Cruz and other parts of the California coast, clumping on branches of Monterey pine, coastal redwoods and eucalyptus, where ...

Monarch butterfly migration is a long journey. Learn how these amazing butterflies make the trip, where monarchs migrate to and why.

Monarch butterfly sightings may be sparser than usual in the U.S. and Canada following a drastic drop in populations wintering in Mexico, researchers told ABC News. The annual census of the number of ...