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Many monarch overwintering sites are contained within the "coastal zone"; an area defined by the Coastal Zone Management Act [1] to be 1000 yards inland from the high tide mark. Large number of overwintering sites are outside the coastal zone. There are more than 450 overwintering sites in California.
Western monarch numbers are vastly improved over the winter of 2020-21, when researchers counted less than 2,000 of the iconic pollinators overwintering along the Central and Southern California ...
Monarch butterfly migration is the phenomenon, mainly across North America, where the subspecies Danaus plexippus plexippus migrates each autumn to overwintering sites on the West Coast of California or mountainous sites in Central Mexico. Other populations from around the world perform minor migrations or none at all.
The monarch butterfly overwintering population hit an all-time low in 2020, with fewer than 2,000 counted across all of California. The very next year, however, the population saw a rebound ...
The number of western monarch butterflies overwintering in California dropped by 30% last year, likely due to how wet it was, researchers said Tuesday. Volunteers who visited sites in California ...
D. plexippus, described by Linnaeus in 1758, is the species known most commonly as the monarch butterfly of North America. Its range actually extends worldwide, including Hawaii, Australia, New Zealand, Spain, and the Pacific Islands. D. erippus, the southern monarch, was described by Pieter Cramer in 1775.
The Monarch Grove Sanctuary is an urban nature preserve in Pacific Grove, California. It protects the monarch butterflies that winter in Pacific Grove arriving in October. It is maintained by a volunteer crew. [2] About 12–16,000 butterflies stayed at the sanctuary during the 2022-23 winter, making it the fourth largest of its type in California.
There is a ray of hope for the vanishing orange-and-black Western monarch butterflies. The number wintering along California's central coast is bouncing back after the population, whose presence ...