Aleutian cackling goose population rebounds from near extinction to 200,000

Aleutian cackling geese

Fewer than 800 Aleutian cackling geese remained in 1975, with the birds restricted to a single rocky island in Alaska after introduced Arctic foxes destroyed nesting colonies across the Aleutian Islands. Fifty years later, predator removal, the creation of protected wetlands in California and coordinated management along the Pacific Flyway have helped the population recover to nearly 200,000 birds. The recovery has allowed US federal wildlife officials to move the species from protection under the Endangered Species Act to a regulated migratory game bird hunting system. Official documents from the U.S. Fish and Wildlife Service (USFWS), including Federal Register Document 2023-17175, outline the current rules for the species, formally known as Branta hutchinsii leucopareia. Species records from the San Joaquin River National Wildlife Refuge show that the goose was among the first animals protected under early federal endangered species laws. The population decline began in the 18th and 19th centuries, when fur traders released Arctic foxes (Alopex lagopus) on nearly 200 islands across the Aleutian chain. The introduced predators attacked ground nests, killed adult birds and ate eggs. Over time, breeding colonies disappeared from almost the entire natural nesting range.

Invasive foxes pushed the goose towards extinction

By the middle of the 20th century, wildlife experts feared the Aleutian cackling goose had disappeared from most of its historic breeding grounds, which once stretched across the Aleutian Islands, Commander Islands and Kuril Archipelago. In 1962, USFWS biologist Robert Jones found a surviving group of about 300 to 800 birds on Buldir Island. The remote volcanic island in the western Aleutians had steep cliffs and harsh conditions that prevented fur traders from bringing Arctic foxes there. The Buldir flock became the only remaining wild population and the main genetic source for later recovery efforts. In 1967, the Aleutian cackling goose was given formal protection under the Endangered Species Preservation Act, which came before the modern Endangered Species Act of 1973. The USFWS then began a long-term recovery programme with two main goals: remove introduced foxes from former breeding islands in Alaska and protect important winter feeding and resting areas along the Pacific Flyway. Removing Arctic foxes from islands including Agattu, Amchitka and Kiska took decades of work by federal wildlife teams. Once the islands were free of the introduced predators, managers released captive-bred geese and moved wild birds from Buldir Island to help rebuild breeding colonies. Early attempts faced problems from native predators such as bald eagles. However, improved release methods and the use of both captive-bred and wild birds helped increase survival. With more breeding sites protected, the population slowly began to grow. Numbers rose from fewer than 1,000 birds in the mid-1970s to several thousand by the late 1980s.

California refuges gave migrating geese a safe winter home

Protecting breeding areas in Alaska solved only part of the problem. Every autumn, Aleutian cackling geese migrate thousands of miles south along the Pacific Flyway to spend the winter in California's Great Central Valley. In 1975, federal officials completely closed hunting in important California migration areas to remove hunting pressure while the population was still extremely low. In 1987, the USFWS established the San Joaquin River National Wildlife Refuge under the Endangered Species Act and Migratory Bird Conservation Act. The refuge was created in part to protect winter habitat for the recovering geese. Located where the San Joaquin, Tuolumne and Stanislaus rivers meet, the refuge provided safe places for the birds to rest and find food during the winter. Refuge staff managed crops such as corn and winter wheat, built roosting ponds and carried out large-scale habitat restoration. More than 500,000 native trees and shrubs, including valley oaks, willows and cottonwoods, were planted across 2,500 acres of river floodplain. The work created one of the largest connected riparian woodland restoration projects in California's Central Valley. Public species information from the San Joaquin River National Wildlife Refuge shows that thousands of Aleutian cackling geese now gather there every winter. The birds use protected wetlands and nearby agricultural fields for feeding and resting from late autumn until early spring before flying north again to their Alaskan breeding grounds.

Growing population brings new hunting rules

By 1990, the USFWS had changed the Aleutian cackling goose's status from endangered to threatened. Continued population growth eventually led to the species being removed from the Endangered Species Act in 2001, when its numbers passed 30,000. As the population grew beyond 100,000 and moved towards 200,000, the main challenge changed. Instead of preventing extinction, wildlife managers had to deal with local problems caused by large numbers of geese, particularly damage to farmland. In spring, migrating geese gather in northern California coastal counties such as Humboldt and Del Norte. They feed heavily on nutrient-rich pastures, and large groups can create financial problems for cattle ranchers and dairy farmers. To balance farming concerns with wildlife protection, federal and state agencies introduced limited late-season hunting and hazing programmes. These efforts are designed to move large flocks away from private farmland and towards managed public areas such as the Humboldt Bay National Wildlife Refuge and Lake Earl Wildlife Area. Federal Register Document 2023-17175, which sets the migratory bird hunting frameworks for the 2023-24 season, confirms that the Aleutian cackling goose is now managed under normal migratory game bird hunting rules in the Pacific Flyway. The rules set limits on hunting seasons, daily bag numbers and specific hunting zones. The aim is to keep hunting at sustainable levels while helping reduce local agricultural damage. The Aleutian cackling goose weighs between four and six pounds. It can be recognised by its relatively small body, dark feathers and a clear white ring around the base of its neck. Its recovery from fewer than 800 birds in 1975 to around 200,000 today is considered one of the most successful bird conservation efforts in North American wildlife management. The USFWS continues to track the population through aerial and ground surveys across Alaska's breeding areas and California's wintering grounds. These surveys help officials ensure that controlled hunting and habitat protection keep the population stable across the Pacific Flyway.