One female monarch butterfly can lay between 300 and 500 eggs. After attaching one egg to a leaf or stem, the female moves on to look for the next place to lay an egg.

This Monarch butterfly, originally tagged near a Des Moines suburb, was located as it sat on a thistle 100 miles away on a farm in western Iowa in late September.

This monarch and its companions, Green and his collaborators expect, will carry the sensors to the mountains of central Mexico, 800 miles south. In a few weeks, the researchers will follow the ...

Their multi-month and multigenerational migration north of about 3,000 miles begins in February or March. Each monarch lives only between two and six weeks. During migration, the female monarch mates, ...

The monarch butterfly population has declined in recent decades, leading to a proposed listing as threatened under the Endangered Species Act. People can help monarch butterflies by planting ...

In a 2022 study, we analyzed counts of monarch butterflies during the North American Butterfly Association’s annual butterfly counts, when private citizens gather around the Fourth of July each year ...

The brightly colored insects have been reported in southeast Michigan, migration watchers say. "Monarch butterflies are of the most recognizable and beloved butterfly in North and Central America.