Over the past 40 years, the number of monarchs overwintering in Mexico has declined by as much as 80%, and the number in California has fallen by over 95%, probably due to multiple causes.
Listing a species as threatened under the Endangered Species Act means that it is nearing, but does not yet face, imminent extinction. The main basis for the proposal to list monarchs as threatened is that researchers are seeing fewer of the butterflies each year at their overwintering sites.
The U.S. Fish & Wildlife Service is proposing to protect monarchs as a threatened species... soliciting public comments on this proposal through March 12, 2025.
Some parts of the actions that have been proposed to reverse their decline are likely to be helpful. Other aspects, however, might only make the situation worse.
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