Alcatraz Coyote Actually Swam Miles
- National Park Service researchers said May 4 the coyote filmed reaching Alcatraz in January likely started on Angel Island, not San Francisco. - DNA from scat matched the male coyote to Angel Island, making the swim nearly 2 miles across cold, choppy bay water. - That matters because Alcatraz has no breeding coyotes — so one animal can still reshape bird colonies and management plans.
A coyote on Alcatraz already sounded improbable. A coyote that swam there through San Francisco Bay sounded almost cartoonish. But the new twist is better than the original story — park researchers now think the animal did not come from San Francisco at all. He likely launched from Angel Island, which turns the trip from a hard swim into a genuinely wild one. (nps.gov) ### What changed here? The big update landed on May 4, when the National Park Service said months of fieldwork and genetic analysis pointed to Angel Island State Park as the coyote’s origin. When the animal first showed up on Alcatraz on January 31, the easy assumption was San Francisco — it is close(nps.gov)t assumption. (nps.gov) ### How did they figure that out? Basically, from poop and persistence. Researchers collected scat from the coyote on Alcatraz and compared its DNA with samples gathered from coyotes in San Francisco and on Angel Island. The Alcatraz sample lined up with the Angel Island population, which let biologists narrow the likely starting point without ever tagging the animal before the swim. (nps.gov) ### Why is Angel Island such a bigger deal? Distance, currents, and water temperature. The San Francisco-to-Alcatraz theory implied a swim of a little over 1 mile. Angel Island pushes that to nearly 2 miles — roughly twice as far — through cold, choppy water that is famous for making even human cross(nps.gov)much messier, more exposed route than anyone first thought. (nps.gov) ### Was this coyote already unusual? Very. Park staff say this is the first documented coyote on Alcatraz since the National Park Service took over management of the island in 1972. Coyotes are good at slipping through cities, crossing roads, and using fragmented habitat. But an open-water island crossing like this is different — more like a marathon swim than an urban detour. (sfgate.com) ### Why do park managers care so much? Because Alcatraz is not just a tourist site. It is also habitat for nesting seabirds and other wildlife. A single predator on a small island can have outsized effects — raiding nests, disrupting breeding, and forcing managers to choose between letting nature play out and p(sfgate.com)ment problem. (sfgate.com) ### Did the coyote stay there? For a while, yes. The animal was seen after the original swim, which suggested he survived the crossing and was moving around the island. Earlier this year, park officials were already weighing whether to capture and relocate him because Alcatraz is such a constrained environment. (sfgate.com)ere he came from — and maybe where he could go next. (sfgate.com) ### So what does this say about coyotes? Coyotes are absurdly adaptable. That is the real story underneath the stunt. They already thrive in suburbs, ports, parks, and dense cities. Now one has apparently treated a cold bay channel like a solvable logistics problem. The catch is that adaptability is impressive right up until it collides with fragile habitat. Then it becomes a conservation headache. (nprillinois.org) ### Bottom line? The news is not just that a coyote reached Alcatraz. It is that researchers now think he came from farther away, by a harder route, than anyone guessed. That turns a weird Bay Area wildlife anecdote into a sharper reminder — animals keep testing the boundaries humans think are fixed. (nps.gov)
