For decades, invasive rats ruled Wake Atoll. The rodents, believed to have arrived during World War II when the remote coral ring served as a military outpost, preyed on seabird eggs, chicks, and even incubating adults, hollowing out colonies that had nested there for centuries. Now, following a grueling eradication campaign that failed on its first try and had to be completely redesigned, the birds are coming back in force.
Black-footed albatross have recolonized the atoll. Year-round nesting activity has been documented across the refuge. And during a 2024 field visit, observers reported something that would have been unthinkable just a few years earlier: not a single live rat was spotted on the island.
The turnaround on Wake, a flyspeck of land roughly 2,300 miles west of Honolulu, is one of the most striking examples yet of what can happen when invasive predators are removed from Pacific island ecosystems. But scientists caution that the recovery, while dramatic, has not yet been confirmed with the kind of rigorous population data needed to declare it a verified record.
A first attempt that fell short
Wake Atoll is a National Wildlife Refuge managed by the U.S. Fish and Wildlife Service, but it also hosts an active U.S. Air Force installation, making logistics unusually complicated. The atoll consists of three low-lying islets surrounding a lagoon, with rocky intertidal zones that proved critical to the story of what went wrong the first time.
An initial rat eradication attempt failed, and a peer-reviewed analysis published in Wildlife Research attributed the failure partly to constraints in treating intertidal habitats. Rats survived bait applications by retreating to rocky shoreline zones that were nearly impossible to cover thoroughly. A separate technical account archived by the University of Nebraska-Lincoln described the campaign as “part success, part failure, but wholly instructive,” noting that while some rat populations were eliminated, others persisted because of gaps in habitat coverage and limits on bait delivery.
To make matters worse, a previously undetected invasive rat species was discovered during subsequent review, meaning the original plan had been designed for the wrong enemy.
Redesigning the operation
The lessons from that failure became the blueprint for a second attempt. USDA APHIS published a revised environmental assessment and Finding of No Significant Impact for the Wake Atoll Rat Eradication Program. The updated review accounted for the additional rat species and concluded the program would cause no significant environmental harm, clearing the way for renewed operations.
The Center for Environmental Management of Military Lands (CEMML) at Colorado State University deployed a field team to support the effort, focusing on more complete coverage of the shoreline and intertidal zones that had undermined the first campaign. During 2024 operations, the team reported seeing no live rats during a site visit, a stark contrast with earlier years when rodents were readily observed around buildings and nesting areas.
That observation, while encouraging, represents a snapshot rather than a formal declaration of success. Eradication programs on Pacific islands typically require two or more years of sustained monitoring using tracking tunnels, bait stations, and camera traps before an island can be certified rat-free.
The birds return
Even without a final all-clear on rats, the seabirds are not waiting. The U.S. Fish and Wildlife Service’s species overview for Wake Atoll now lists both black-footed and Laysan albatross among the birds using the refuge, confirming that large, ground-nesting species are once again attempting to breed on the atoll. The FWS page confirms the presence of these albatross but does not specify the number of breeding pairs or the exact year recolonization was first observed. These albatross are especially vulnerable to rat predation; their eggs sit exposed on the ground, their chicks are defenseless for months, and incubating adults have been documented suffering attacks from rats on other Pacific islands.
Their return signals that conditions on Wake have shifted enough to support breeding pairs that would not have survived under chronic rat pressure. Multiple other seabird species, including terns, noddies, and shearwaters, also nest on the atoll and may be benefiting from reduced predation, though detailed productivity data like fledging rates and chick survival have not been published.
The recovery fits a pattern seen across the Pacific. On Palmyra Atoll, Midway Atoll, and Hawaii’s Lehua Island, rat removal has triggered rapid rebounds in seabird populations, sometimes within just a few breeding seasons. Ground-nesting birds that had been suppressed for generations can recover quickly once the predation pressure disappears, because adult survival rates for many seabird species are naturally high.
What the data can and cannot tell us
The most comprehensive baseline for Wake Atoll’s bird life comes from the Smithsonian Institution’s Atoll Research Bulletin No. 561 (Rauzon, M.J., D.C. Boyle, W.T. Everett, and J. Gilardi, 2008, “The status of the avifauna of Wake Atoll”), which cataloged species composition, breeding status, and colony sizes before the recent eradication efforts. That document remains the benchmark for evaluating long-term change on the atoll.
No equivalent post-eradication census has been made publicly available as of May 2026. Without updated colony counts or nesting density figures, it is not yet possible to confirm whether current seabird numbers exceed any previous documented peak. The dramatic recovery described by federal agencies and field teams is real, but references to “record highs” should be understood as reflecting the trajectory of recovery rather than a formally verified statistical milestone.
The discovery of a previously undetected rat species also raises a lingering question: whether additional cryptic populations could persist in habitats that have proven difficult to treat, such as crevices in shoreline rock or debris fields along the high-tide line. Only sustained, methodical monitoring will resolve that uncertainty.
Threats that remain even without rats
Even if rats are fully eliminated, Wake Atoll’s seabirds face challenges that no eradication campaign can solve. The atoll’s islets sit just a few feet above sea level, making nesting habitat vulnerable to storm overwash and erosion. Climate-driven changes in storm frequency and sea-level rise could destroy nests and shrink the area available for colonies in coming decades.
Shifts in ocean productivity, driven by warming waters and changing currents, could also affect the food supply for species like albatross that forage across vast stretches of open ocean. No comprehensive climate projections specific to Wake Atoll have been published alongside the eradication documents, leaving open questions about how resilient the recovering populations will be over the long term.
Why sustained monitoring will decide the outcome
For now, the story on Wake is one of hard-won progress. A first attempt failed. Managers studied what went wrong, discovered a hidden adversary, and went back with a better plan. The rats appear to be gone, and the birds are returning to nest on ground they had largely abandoned. Whether the numbers ultimately reach verified records will depend on the monitoring that comes next, but the direction of the recovery is unmistakable.
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*This article was researched with the help of AI, with human editors creating the final content.
