How to Identify Eagle in Alaska

An adult bald eagle is large and distinctive. The body and wings are dark brown or blackish, but the head, neck, and tail are brilliant white. The contrast between the dark body and white head is the most obvious identification feature from a distance. The eyes are bright yellow, and the beak is large, heavy, and hooked, also yellow. The legs and feet are yellow with large, dark talons. An adult bald eagle in Alaska typically measures 28 to 40 inches long with a wingspan of 6.5 to 7.5 feet, making it one of the most recognizable raptors in the state. When perched, they appear bulky and powerful. In flight, they hold their wings flat, almost like a plank, rather than in a vee shape.

Young bald eagles lack the white head and are often mistaken for other raptors, especially golden eagles and buteos. Immature bald eagles are mostly dark brown throughout, and the white head develops gradually over 4 to 5 years. A first-year bird is almost entirely brown with some lighter patching on the underside of the wing and sometimes on the head. By the second or third year, white appears in patches on the head and tail. The key difference from a golden eagle is that as a bald eagle matures, the white appears first on the head and tail, whereas a golden eagle never develops white head markings. Immature bald eagles also have a pale eye, whereas young golden eagles have a dark eye throughout their lives. The beak on an immature bald eagle is dark at first and gradually turns yellow.

A golden eagle is uniformly dark brown, nearly black, with a golden or russet tone on the crown and nape of the neck, which is visible up close or in good light. The golden crown and nape give the species its name, but at a distance or in poor light, a golden eagle appears all dark. Golden eagles are slightly smaller and more streamlined than bald eagles, with a smaller, more refined head and a relatively slimmer beak compared to the hefty beak of a bald eagle. The legs are feathered all the way down to the toes, whereas a bald eagle has bare yellow legs below the tarsal joint. Golden eagles in Alaska are most often seen in open country, tundra, and mountain areas rather than near water. Their flight is more buoyant and agile than that of a bald eagle, and they often soar with their wings held in a slight vee.

From a distance in flight, the two species have different silhouettes and behavior. A bald eagle holds its wings flat and straight like a plank when soaring, and an adult bald eagle's white head and tail are visible at great distance even with binoculars. A golden eagle holds its wings in a slight vee or dihedral angle, and the entire bird appears uniformly dark. A golden eagle's flight is more graceful and buoyant, while a bald eagle appears heavier and more powerful in the air. Bald eagles often fly low over water hunting for fish, whereas golden eagles hunt over open ground and mountains. A bald eagle flaps slowly and heavily; a golden eagle's wing beats are quicker and more agile. The head shape also differs: a bald eagle's head appears large and bulbous, while a golden eagle's head appears smaller and more streamlined.

Bald eagles produce surprisingly weak vocalizations. Many people expect a bold, loud cry, but bald eagles actually make chirping, whistling, or thin screaming calls that can sound almost small compared to the size of the bird. They vocalize most often when defending territory or during courtship. Golden eagles are similarly quiet, but they occasionally make higher-pitched whistles or soft vocalizations. Both species are more often seen in silence than heard. If you hear a loud, harsh call near water in Alaska, it is more likely a raven, osprey, or loon than an eagle. The challenge of identifying eagles by sound alone means that visual identification remains the most reliable field technique in the state.

Bald eagle tracks are large and distinctive. A footprint shows four toes, with three forward-facing and one behind (the hallux), and the tracks typically measure 4 to 5 inches across. The talon marks are deep and pronounced. You may also find feather molts, which are large and recognizable, especially the distinctive white feathers from an adult's head or tail. Perches and nesting sites are obvious signs: large stick nests in tall trees or on cliff edges, whitewash (droppings) on rocks or branches below favorite perches, and plucking sites where the bird has stripped feathers and skin from prey on a rock or log. Golden eagle tracks are similar in size, and nesting and feeding signs follow the same pattern. Both species leave bones, fish scales, and fur at feeding and roosting sites.

In Alaska, several other large raptors can cause confusion, especially immature bald eagles. Red-tailed hawks are smaller and have a different silhouette, with a shorter tail and smaller head. Rough-legged hawks, which are common in Alaska, have white on the tail and wings and are noticeably smaller than either eagle species. Osprey are smaller and lighter, with a clear white underside and dark mask. Northern harriers are slimmer and have a distinctive facial disc. The most challenging confusion occurs between immature bald eagles and golden eagles, but remember that immature bald eagles develop white on the head and tail as they mature, whereas golden eagles remain uniformly dark throughout their lives.

Bald eagles are visible year-round in Alaska, but sightings spike from June through August when salmon runs attract them to rivers and coastal areas. Certain hotspots like Brooks Falls in Katmai National Park concentrate eagles during peak salmon season. Golden eagles are less common but present in open tundra, mountain passes, and higher elevations, particularly in interior and northern Alaska. Both species breed in Alaska, so spring and early summer offer good viewing opportunities during courtship and nesting. Late fall and winter see continued presence, though numbers decline somewhat. Clear days with good lighting make identification easier than overcast or stormy conditions. Binoculars or a spotting scope greatly enhance your ability to see field marks from a distance.

Bald eagles hunt primarily fish, which they snatch from the water with their talons while flying just above the surface. They also hunt waterfowl, seabirds, and small mammals. Recent kills show blood, feathers, or fur scattered on a rock, log, or shoreline where the eagle has plucked and eaten the prey. Fish scales and skeletal remains are common signs near bald eagle feeding perches. Golden eagles hunt from the air or from high perches, diving at ground-dwelling prey such as hares, squirrels, and ptarmigan. A golden eagle kill site often shows a shallow depression or plucking area on open ground or a low rise. The presence of large prey remains near a prominent perch is a strong indicator of recent eagle activity.

The white head of an adult bald eagle evolved as a display trait related to courtship and social status within the species. Young bald eagles are brown and gradually acquire white plumage over years of development. The bright white head may serve as a visual signal of age and health to potential mates and rivals. Golden eagles never develop white head plumage; their species evolved a different appearance suited to their typical open-country and mountainous habitat where visual signals across long distances may be less critical than speed and maneuverability in flight. The two species occupy distinct ecological niches in Alaska, and their different appearances reflect their different hunting strategies and habitat preferences. Understanding that color change with age is a normal part of bald eagle development helps prevent confusion when you encounter birds in transitional plumages.