California Monarch Butterfly Population In Sharp Decline | Weather.com
April 25, 2025Updated: April 25, 2025, 12:00 pm EDTPublished: April 25, 2025, 12:00 pm EDT

Hundreds of volunteers and partners participated in the 28th annual Western Monarch Count by attempting to identify all of the overwintering monarch butterflies in California. The results coincide with monarch butterflies being proposed for protection under the U.S. Endangered Species Act. It is the second lowest overwintering population recorded since tracking began in the 1990s.

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