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Coyote Who Swam to Alcatraz Island Went Twice as Far as Previously Thought
DNA analysis showed the coyote came from Angel Island, confirming a 2-mile swim to Alcatraz that biologists had not expected.
On Sunday, the National Park Service announced that DNA testing confirmed the coyote spotted at Alcatraz Island earlier this year originated from Angel Island State Park, not San Francisco.
Biologists initially assumed the animal swam from San Francisco, which is 1.6 kilometers away, but the coyote actually completed a much longer 3.2 kilometers swim from Angel Island.
Ben Sacks at the University in Davis matched scat samples to the Angel Island population, confirming the origin after NPS staff surveyed Alcatraz for tracks and evidence.
Despite relocation efforts to protect seabird nesting habitats, officials never captured the coyote on cameras or found it on Alcatraz, and "we don't know what happened to the coyote," said NPS wildlife ecologist Bill Merkle.
Project Coyote founder Camilla Fox said the coyote likely sought a mate or new territory, noting that while coyotes can swim, "it is incredibly rare for humans to spot one.