The butterflies are back! Annual migration of monarchs shows highest numbers in years
The annual winter monarch butterfly migration, which has seen steep declines in recent years, seems to be making a comeback. Biologists are encouraged and confused by the trend.
by Michael Levitt
Nov 26, 2021
2 minutes
Every year, monarch butterflies from all over the western U.S. migrate to coastal California, to escape the harsh winter weather. In the 1980s and '90s, more than a million made the trip each year.
Those numbers have plummeted by more than 99% in
You’re reading a preview, subscribe to read more.
Start your free 30 days