Between 1999 and 2006, crews working across California’s Channel Islands captured and relocated 44 golden eagles. Between 2005 and 2006, contractors removed more than 5,000 feral pigs from Santa Cruz Island. On that island, the native fox population had fallen to 55 animals. By the 2024 monitoring season, land managers counted 3,086.

Those numbers bracket one of the tightest wildlife turnarounds on record for a listed mammal. The U.S. Department of the Interior announced in August 2016 that three island fox subspecies had recovered enough to leave the endangered species list, calling it the fastest successful recovery of any mammal ever listed under the Endangered Species Act. The 2025 status update from Friends of the Island Fox, drawn from the island fox working group’s May 15, 2025 meeting, carries the count forward into the present and shows what the islands look like now that the emergency phase is over.

Fifteen foxes, twice over

The island fox is a small canid found nowhere but these islands, roughly cat-sized and descended from mainland gray foxes that arrived thousands of years ago. Six of the eight Channel Islands hold their own subspecies, each genetically distinct, each confined to a scrap of land in the Pacific. That isolation is the whole reason the animal exists. It is also why the population math turned lethal so fast.

According to Interior’s accounting, San Miguel Island’s fox population fell from about 450 animals to 15. Santa Rosa fell from 1,780 to 15. Santa Cruz, the largest island in the chain, fell from more than 1,400 to 55. Those were the late 1990s figures, and at that scale a single bad season could have finished the job.

The driver was predation by golden eagles, and the reason golden eagles were there at all traces back to a chemical. Bald eagles, which eat fish and seabirds and do not hunt foxes, had historically held territory across the islands. DDT contamination wiped them out of the archipelago, leaving the niche open. Golden eagles moved in, found feral pigs breeding freely on Santa Cruz, and settled into a food supply that could sustain them year-round. A resident raptor population subsidized by piglets then hunted island foxes as a side course, and the foxes, which had evolved with no aerial predator worth fearing, had no behavioral defense against it.

On Santa Catalina Island, a different agent did the damage. Canine distemper swept through and collapsed that population separately, a reminder that a species living in six small pockets can be attacked from six different directions at once.

Eagles out, pigs out, foxes back

The response addressed the food web rather than the foxes alone. Interior’s tally lists 44 golden eagles relocated from the islands between 1999 and 2006, and more than 5,000 feral pigs removed from Santa Cruz in 2005 and 2006. Pulling the pigs mattered as much as pulling the raptors, because the pigs were the reason golden eagles could stay. Remove the year-round prey base and the islands stop supporting a resident predator that foxes cannot survive.

At the same time, 61 bald eagles were released on the islands between 2002 and 2006, restoring the fish-eating raptor that had occupied the territory before DDT. Captive breeding programs returned 226 foxes to the wild. Managers vaccinated foxes against canine distemper, the pathogen that had gutted Catalina, and built the vaccination work into ongoing monitoring so that an outbreak on one island would not have free run of the population.

By August 2016, Interior removed the San Miguel, Santa Rosa, and Santa Cruz island fox subspecies from the endangered species list as recovered, and downlisted the Santa Catalina subspecies from endangered to threatened. Fifteen animals on San Miguel had been a functional extinction notice. The delisting came roughly a decade and a half later.

What the 2024 counts show

Recovery did not end the counting. Land managers surveyed the islands between June 2024 and January 2025, and Friends of the Island Fox compiled the results for the working group.

Santa Cruz came in at 3,086 foxes. That is down from a 2023 estimate above 4,000, which the working group treats as an anomaly tied to weather and survey access rather than a real population crash. San Miguel, the smallest of the three delisted islands, was estimated at about 322 foxes, down from roughly 525 the prior year, a shift read as density rebalancing on a small island rather than a decline requiring intervention. Foxes at high density compete, and small islands correct.

One island is not behaving. San Clemente’s population declined for a third consecutive year in 2024. Adult survival is down, and only seven pups were documented across the monitoring season. The cause is under investigation, and no one has assigned one. That is the honest state of the record, and it is the argument for keeping the monitoring apparatus in place on islands that no longer carry federal listings. A recovered subspecies is still a subspecies with one island, one gene pool, and no second address.

The Santa Cruz spine of this story is the part worth holding onto: 55 foxes, then 44 eagles moved, then more than 5,000 pigs cleared, then 3,086 foxes counted in 2024. Nobody bred the population back from 55 to 3,086. The captive program returned 226 animals across all islands combined. What produced the rest was an island where the predator subsidy had been removed and the original raptor restored, leaving a small fox free to do what small foxes do on ground with enough food and nothing hunting from above.