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DNA Links Alcatraz Coyote to Angel Island After Two-Mile Swim

The finding reshapes how park biologists view rare bay crossings by predators.

Overview

  • The National Park Service disclosed Monday that DNA from scat tied the Alcatraz coyote to Angel Island, overturning the assumption it came from San Francisco.
  • UC Davis’s Veterinary Genetics Laboratory confirmed the match and identified the animal as a male previously sampled from the Angel Island population.
  • The result points to a roughly two-mile crossing through cold, fast bay currents, about twice the 1.25-mile route from the city’s waterfront.
  • After January video and a Jan. 24 photo documented the visitor, park biologists searched for tracks, set trail cameras and audio recorders, and readied a humane relocation to protect nesting seabirds.
  • Officials report no further detections and no remains on Alcatraz, a 22-acre island with no fresh water that serves as sensitive seabird habitat within Golden Gate National Recreation Area.