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7 lut 2024 · Figure 1. Total Area Occupied by Monarch Colonies at Overwintering Sites in Mexico. Report: Areas of forest occupied by the colonies of monarch butterflies in Mexico, during the 2023-2024 overwintering period. WWF story: Eastern migratory monarch butterfly populations decrease by 59% in 2024.
Based on this estimate the largest population of monarchs occurred in 1996-1997 when the colonies covered over 18 hectares and contained an estimated 380 million butterflies. To date the lowest population recorded was in 2013-2014 with 0.67 hectares and approximately 14 million monarchs.
21 mar 2023 · The Eastern migratory monarch butterfly is at risk: new reports show a sharp population decline and a loss of habitat in the forests where they winter each year. In just one year, the presence of monarch butterflies in their wintering grounds dropped 22%, from 7 acres to nearly 5.5. acres.
Results from the 2023 mid-season Western Monarch Count: Volunteers counted 233,394 butterflies at 257 overwintering sites in the West. Read our blog for complete summaries of the 27th annual mid-season count (formerly referred to as the “Thanksgiving count”), which occurred November 11 – December 3, 2023. Figure 1.
Monarch Winter 2022–2023 Population Numbers Released. On March 21, 2023, the World Wildlife Fund-Telmex Telcel Foundation Alliance (WWF) and the National Commission of Protected Natural Areas in Mexico (CONANP), released data from the winter 2022–23 monarch butterfly population counts.
On May 24, 2022, the World Wildlife Fund-Telmex Telcel Foundation Alliance (WWF) and the National Commission of Protected Natural Areas in Mexico (CONANP), released data from the winter 2021–22 monarch butterfly population counts.
From this page, you have two ways of accessing monarch population trend information. One is our Regional Data Summaries of western and eastern populations during each of the four key migratory seasons (at right).
