Millions of black and orange wings will flutter across the U.S. this spring, as the monarch butterflies make their annual ...

This year’s count of 4.42 acres of occupied forest habitat is nearly twice as large as last year's, but eastern monarch ...

US butterfly populations are declining because of insecticides, climate change and habitat loss, with the number of the ...

The population wintering in central Mexico's forests occupied 4.42 acres, up from 2.22 acres during the previous winter.

As summer comes to an end and temperatures start to drop, the butterfly migration season begins. The first few weeks of ...

A new study, involving researchers from the Institute of Science and Technology Austria (ISTA), suggests that the butterflies’ varying migration distances are influenced by environmental factors ...

and is seen in species as varied as monarch butterflies, caribou, and baleen whales. The main source of energy used for migration is fat. Fat stores about 8–10 times more energy than the ...

Colony estimates at central Mexico overwintering sites indicate that monarch butterfly (Danaus plexippus) populations have declined over the past two decades. Among the leading causes of this ...

“You can have a butterfly garden in your backyard, but leave the monarchs alone and don’t interfere.” Both DeWaard and Davis said they expect the monarch will continue to survive as a species; it’s ...

The journey is the most evolutionarily advanced migration of any known butterfly, perhaps of any known insect. But climate change and habitat loss, both in the forest (photographed here in ...

Monarch butterflies -- including western monarchs ... their chrysalises when conditions are no longer suitable for fall migration. Though the field survey showed that monarch arrival times ...