The journey spans multiple generations, with each generation flying a portion of the route before laying eggs and passing the ...

This winter, volunteers from the Xerces Society, a nonprofit environmental group, tallied just 9,119 western monarchs — a ...

The U.S. Fish and Wildlife Service is taking steps to list monarch butterflies as threatened species and designate seven ...

The natural phenomenon of the iconic monarch butterflies migrating south for the winter is a fascinating one - and it's one ...

A winter count of visiting monarch butterflies found a steep drop from previous years, which has scientists worried about the ...

Monarch populations east of the Rockies ... In the spring, overwintering butterflies mate and fly north, eventually stopping to lay eggs once they find milkweed. This new generation continues ...