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A male coyote reached Alcatraz Island earlier this year after crossing two miles of San Francisco Bay. Researchers had not anticipated a swim of that length. The animal navigated cold, choppy waters that biologists previously viewed as a barrier too difficult for the species to overcome.
Discovery of the Crossing
Biologists first noticed signs of the coyote on the island during routine monitoring. Tracking data later confirmed the full route from the mainland. The distance proved roughly double the maximum previously recorded for similar movements in the region.
Staff on Alcatraz reported the animal’s presence through tracks and occasional sightings. Follow-up analysis of the path ruled out any shorter route or human assistance. The finding prompted a review of how coyotes use the bay’s currents and islands.
Conditions That Made the Swim Possible
San Francisco Bay presents strong tides and low water temperatures year-round. The coyote completed the journey despite these factors, which experts had considered limiting. No prior observations had documented a comparable effort by the species in this location.
Researchers noted that the animal likely timed its movement with favorable tidal flows. Such behavior aligns with known coyote adaptability in other coastal areas. Still, the exact triggers for this particular crossing remain under study.
Broader Questions for Bay Wildlife
The event raises new considerations about how urban wildlife navigates fragmented habitats. Islands like Alcatraz may serve as temporary refuges more often than assumed. Continued monitoring will help determine whether this crossing represents an isolated case or part of a larger pattern.
Biologists continue to collect data on coyote movements around the bay. Future observations could clarify the limits of their swimming ability in similar environments. The current record stands as a benchmark for those studies.
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