Monarch Joint Venture Blog
Only 1,914 western monarchs observed at overwintering sites during the 2020 Thanksgiving Count
The western monarch population is down 99.9% from historical estimates of overwintering populations in the 1980s. Read More
Eastern Monarch Population Numbers Decrease 53% from Last Year
Eastern monarch population numbers have been released for 2019-2020. Read More
Western Monarch Population Remains Critically Low
2019 Western Monarch Thanksgiving Count reveals a critically low California overwintering population, almost identical to last year's population. Read More
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Monarch Butterfly ESA Listing Decision Deadline Extended
The USFWS deadline to determine whether the species warrants federal protection has been extended to December 15, 2020. Read More
Field Notes: State of Mexico, Mexico, January 28-February 1, 2019
Alison Cariveau, MJV Science Coordinator, shares her recent visit to Mexico to participate in the Trinational Monarch Science Meeting, and visit a monarch overwintering sanctuary. Read More