The number of monarch butterflies overwintering this year in Mexico has nearly doubled, according to the annual census data ...

The splashy monarch butterfly only lives about five weeks, but its entire survival is in question due to threats posed by ...

These late-blooming plants native to North America help feed butterflies — especially monarchs-— at a crucial point.

A study compiled data from more than 76,000 butterfly surveys across the continental U.S. The declines seen in the last 20 ...