Monarchs in Mexico Increase, yet US Butterflies Are Declining

Xerces Society logo

March 11, 2025 | View as Webpage

Xerces director Scott Black has a straightforward prescription for keeping our skies filled with butterflies. “Butterflies need host plants on which to lay eggs, wildflowers on which to feed, a refuge from pesticides, and sites to overwinter. There is hope for these animals if we focus on providing habitat for butterflies across all landscapes, from cities and towns to agricultural lands to natural areas.”

Study Finds That US Butterfly Populations Are Severely Declining

A new study published last week in Science found that the total abundance of butterflies in the U.S. declined by 22% from 2000 to 2020. That means that for every five butterflies seen 20 years ago, now there are only four.

Co-authored by the Xerces Society and other members of the Status of Butterflies in the U.S. working group, the study is the most comprehensive assessment of U.S. butterfly population trends ever undertaken.

Learn more

Number of Monarchs Overwintering in Mexico Increases

World Wildlife Fund-Mexico and partners have announced that the number of monarchs overwintering in central Mexico has increased. The butterflies were found covering an area of 4.42 acres, up from last year’s total of 2.22 acres.

Learn more

Monarch Nectar Plant Guides

Providing nectar-rich flowers and milkweed host plants is one of the most significant actions you can take to support monarchs. Xerces provides a list of evidence-based, monarch-specific nectar plants for each region of the U.S. Find yours!

Learn more

Support Federal Protections for the Monarch Butterfly

The U.S. Fish and Wildlife Service has proposed to list the iconic monarch butterfly as a threatened species under the Endangered Species Act. The Xerces Society invites you to join our letter advocating for strong federal protections for the monarch butterfly. Signatures are due by tomorrow, March 12!

Sign your name now

Upcoming events

March 11

Mountain States Bumble Bee Atlas Training

Webinar

March 12

California Bumble Bee Atlas Training

Webinar

March 13

Facts Are Not Enough: Science Communication and Audience Emotions

Webinar

View all events

The Xerces Society is a donor-supported nonprofit organization that protects our world through the conservation of invertebrates and their habitats.

Your tax-deductible donation will help grow and sustain that essential work.

Donate
Become a member
Renew membership
Fundraise
Donation mailing address:

The Xerces Society

PO Box 97387

Washington DC, 20090-7387

Donation and membership questions:

membership

855-232-6639 (option 2)

Photo credits from top, left: Candace Fallon, Xerces Society

© The Xerces Society

Facebook social media logo
Instagram social media logo
Bluesky social media logo
Youtube social media logo
The Xerces Society | 1631 NE Broadway Street, #821 | Portland, OR 97232 US
Unsubscribe | Update Profile | Constant Contact Data Notice