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The U.S. Fish and Wildlife Service has estimated that there is a 96% to 100% probability that the western monarch population will collapse within 50 years, and an 80% probability for the species’ eastern population.
Eastern monarch butterflies, which reside on the eastern side of the Rocky Mountains, have faced a population decline of about 70% since the early 1990s, while the western population has seen its population decline by about 99% since the 1990s.
“Forty-seven species have gone extinct waiting for their (Endangered Species Act) protection to be finalized. This decision continues the delay in implementing a national recovery plan, which monarchs desperately need,” Tierra Curry, Center for Biological Diversity senior scientist, said in Tuesday’s release. “Monarchs are beautiful, they play important roles in nature and culture, and their migrations are jaw-dropping. We owe them and future generations an all-in commitment to their