Bald Eagle

The bald eagle (Haliaeetus leucocephalus) is one of the most powerful and iconic birds of prey in the world — the national bird and symbol of the United States of America, and a species whose story encompasses both near-catastrophic decline and one of conservation history's most celebrated recoveries. A large sea eagle with a wingspan reaching 2.3 meters and a weight of 3 to 6.3 kilograms (females are significantly larger than males), the bald eagle is found throughout North America from Alaska and Canada to Mexico, inhabiting areas near large bodies of water with abundant fish and old-growth trees for nesting. The name 'bald' does not refer to a lack of feathers — rather, it derives from the Old English word 'balde,' meaning white, a reference to the striking white head and tail of adults, which contrasts dramatically with the dark brown body. Immature bald eagles are mottled brown and white and do not develop the distinctive adult plumage until approximately 4 to 5 years of age, leading to considerable historical confusion about whether young and adult birds were the same species. The bald eagle was adopted as the national symbol of the United States on June 20, 1782, on the Great Seal of the United States — a choice that made it simultaneously the most legally protected and culturally prominent bird in American history.

Adult bald eagles are dramatically patterned: the body and wing feathers are a rich dark chocolate brown, contrasting strikingly with the brilliant white head, neck, and tail. The large, hooked bill is bright yellow, as are the eyes and feet — the yellow coloration intensifying with age. The feet are powerful, with three front toes and one rear toe (the hallux), each equipped with long, curved, razor-sharp black talons. The grip strength of the feet is extraordinary — bald eagle talons can exert a pressure of approximately 400 pounds per square inch, used to seize and hold slippery fish. The wings are long and broad with 'fingered' primary feathers that spread in the distinctive eagle soaring silhouette, optimized for riding thermals and soaring over water for extended periods. Females are typically 25% larger than males in body mass — a reversal of the dimorphism typical in many species, common among raptors. Immature bald eagles pass through a series of plumage stages over 4 to 5 years, progressing from mottled brown and white through intermediate stages before achieving the definitive adult plumage.

Bald eagles are opportunistic hunters and scavengers, primarily associated with aquatic habitats where fish are available. They hunt by soaring over water and diving to seize fish swimming near the surface with their talons — rarely diving fully submerged, instead snatching prey from the top layer of water in a low-angle approach. They are also notorious pirates, stealing prey from other birds (particularly ospreys, which catch fish more efficiently) through aerial harassment — a behavior called kleptoparasitism that Benjamin Franklin famously criticized when objecting to the bald eagle's selection as the national bird ('a bird of bad moral character'). They consume considerable quantities of carrion, especially in winter, and will also take small mammals, waterfowl, wading birds, turtles, rabbits, and squirrels. Bald eagles are among the most territorial of North American raptors, maintaining and defending large territories year-round. They perform spectacular aerial courtship displays involving high-altitude soaring, mutual cartwheeling (locking talons and spinning toward the ground), and dramatic dives — among the most impressive aerial displays of any bird. They are long-lived and form enduring pair bonds, returning to the same territory and nest site for many years.

Fish constitute approximately 70 to 80% of the bald eagle's diet in most of its range, reflecting its adaptation as a sea eagle. The species eaten varies by region and season: salmon and trout in the Pacific Northwest and Alaska; various freshwater fish (suckers, carp, catfish, perch, bass) in inland areas; and estuarine species (mullet, catfish, and others) in coastal regions. Bald eagles are highly opportunistic, however, and the diet shifts substantially depending on what is most available. Waterfowl — particularly injured, sick, or weakened individuals — are taken throughout the year; during winter, concentrated duck and goose populations in coastal and inland wetlands provide abundant prey. Small to medium-sized mammals (rabbits, muskrats, prairie dogs, young deer) are taken; road-killed deer and other large carcasses are scavenged extensively, particularly in winter when live prey is scarce and bald eagles congregate at riverside locations where fish wash up dead after spawning. Bald eagles are also well-documented stealing food from ospreys, other bald eagles, and occasionally from bears and other large predators. During the Pacific salmon spawning season in Alaska and British Columbia, hundreds of bald eagles may gather along a single river to feed on the mass die-off of post-spawning salmon — one of the most spectacular wildlife events in North America.

Bald eagles are monogamous and typically mate for life, with pairs returning to the same territory and nest year after year. Courtship involves spectacular aerial displays including the 'cartwheel display' — both birds lock talons at high altitude and plummet together in a spinning cartwheel, breaking apart just before reaching the ground. Nest construction begins 1 to 3 months before egg laying, with both adults contributing sticks, grass, and soft material to the growing structure. Nests are among the largest structures built by any bird — they are used and added to year after year, sometimes reaching truly enormous proportions. A clutch of 1 to 3 eggs (most commonly 2) is laid between January and April, depending on latitude. Both parents share incubation over 35 days. The chicks (called eaglets) hatch covered in grey down and develop rapidly, growing from a few hundred grams at hatching to the size of an adult by the time they fledge at 10 to 12 weeks old. After fledging, young eagles spend 4 to 5 years in juvenile and sub-adult plumage, ranging widely before establishing territories and breeding. The combination of late sexual maturity (4-5 years), annual production of typically only 1-2 chicks successfully fledged per nest, and long lifespan creates a population with slow natural turnover.

The bald eagle's relationship with the peoples of North America predates the nation that made it its symbol by thousands of years. For many Indigenous North American peoples — including the Lakota, Ojibwe, Pueblo, Cherokee, and many others — the bald eagle is a sacred bird of exceptional spiritual significance. Eagle feathers are central to many Indigenous ceremonial practices, representing courage, wisdom, and connection to the divine, and are highly regulated under U.S. federal law even for Indigenous use. The U.S. Eagle Feather Law creates a specific exemption to the Bald and Golden Eagle Protection Act allowing members of federally recognized tribes to possess eagle feathers for religious purposes. European settlers viewed the eagle primarily as a pest and pest control measure — shooting it for taking poultry and fish — before its selection as the national symbol in 1782 transformed its legal and cultural status. Today, the bald eagle is protected under three federal laws: the Bald and Golden Eagle Protection Act (1940), the Migratory Bird Treaty Act (1918), and the Endangered Species Act (1973, delisted 2007). Its recovery from near-extinction to thriving populations is studied as a model for raptor conservation worldwide and stands as compelling evidence of what environmental regulations, combined with engaged public support, can achieve for wildlife.