Western Monarch Population Closer to Extinction as the Wait Continues for Monarchs’ Protection Under the Endangered Species Act
By Emma Pelton & Stephanie McKnight on 19 January 2021
During the 24th Western Monarch Thanksgiving Count, nearly 100 volunteers donned their masks and practiced social distancing to carefully survey groves of trees on the California and Northern Baja coast for monarch butterflies. Despite the challenges of conducting field work during a pandemic, volunteers surveyed 246 sites, three more sites than last year. Unfortunately, to the surprise and dismay of many, only 1,914 monarchs were counted at all the sites. This is a shocking 99.9% decline since the 1980s.
The Western Monarch Thanksgiving Count has been done every year since 1997. It happens during the three-week period centered on Thanksgiving and is coordinated by the Xerces Society and Mia Monroe. It is the primary way that the western monarch population is assessed and has built up a body of data than demonstrates the long-term collapse of the monarch migration in western North America.