Monarch butterfly populations are declining, with western numbers at a record low, prompting conservation actions.

The World Wildlife Fund's latest count of migratory monarch butterflies offers some encouraging news for the eastern population while the western population may be struggling to survive.

And March 12 is National Plant a Flower Day, the perfect day to bask in the sunlight and plant flowers that will help pollinators like the monarch butterfly. The sun is out, the birds are chirping ...

Monarch butterflies now confront the Trump administration with its first big Endangered Species Act test, as a lively public comment period is set to end and the serious decisionmaking will begin.

What sounded like leaves rustling in the wind was the flickering wings of thousands of monarch butterflies as they flitted ...

"I'm seeing less and less butterflies and also we're starting to see them later on in the season," said Arty, 43, founder of a website that sells milkweed seeds and plants for monarch ...