Birds of Prey in Flight Identification: Shape First

A raptor overhead is usually backlit, far away and moving, so plumage details are hard to see. Audubon's introduction to raptors in flight makes the point that during migration, when hawks pass in large numbers, birders identify them by silhouette and flight style rather than close-up field marks. Start by fitting the bird into a shape group, then use the few plumage marks you can see to name the species.

• Buteos such as the red-tailed hawk: wings that Audubon describes as thick and bulging, as if they have biceps; a relatively short, broad tail; slow, wide circles on thermals with few flaps. Wikipedia notes that longer-winged buteos have a buoyant flight and shorter-winged ones like the red-tail soar with slower, deeper beats.
• Accipiters such as sharp-shinned and Cooper's hawks: short, rounded wings and a long tail; agile hunters that flap often (Audubon).
• Falcons such as the kestrel, merlin and peregrine: thin, tapered wings for speed and quick changes of direction (Wikipedia). Audubon contrasts the playful kestrel, the purposeful merlin and the powerful peregrine crossing the sky like a jet.
• Vultures: the turkey vulture holds its wings in a shallow V and tips from side to side, flapping very rarely; its gray flight feathers flash silvery in the light (Wikipedia).
• Harriers and kites (in Britain): the marsh harrier flies with its wings in a distinctive V, and the red kite shows a forked tail (The Wildlife Trusts).

Size is the first clue, although it is hard to judge in an empty sky. Wikipedia gives the bald eagle a wingspan of 1.8 to 2.3 m (about 6 to 7.5 feet) and the red-tailed hawk 110 to 145 cm (43 to 57 inches), so an eagle is roughly half again as wide. Then check plumage:

• Adult bald eagle: evenly dark brown body with a white head and white tail.
• Immature bald eagle: dark brown with messy white streaking, until about its fifth year.
• Adult red-tailed hawk: tail brick-red from above and buff-orange below, a whitish belly crossed by a dark band, a dark bar on the leading edge of each wing, and wings often held in a slight dihedral.

Also rule out the turkey vulture, a large dark bird that holds its wings in a shallow V and rocks from side to side (Wikipedia).

Look at the wingtips. Falcons have thin, tapered, pointed wings built for speed and quick turns (Wikipedia); buteo hawks have broad, thick wings and circle slowly on thermals (Audubon). Hovering in one spot over a field points to a kestrel, which The Wildlife Trusts singles out for that behavior. A big, slate-gray falcon with a black moustache is a peregrine (The Wildlife Trusts).

Accipiters are the hawks most often confused with falcons, because both are fast. Accipiter wings are short and rounded rather than pointed.

Often these are two names for the same kind of bird. Wikipedia explains that birds of the genus Buteo are called buzzards in the Old World and hawks in the New World. The common buzzard, Britain's most frequently seen bird of prey, has broader wings and a shorter tail than harriers or the red kite and varies from dark brown to pale (The Wildlife Trusts). In North America the closest equivalents are buteos such as the red-tailed hawk.

So in Britain, the question is usually buzzard (broad wings, short tail, soaring) versus sparrowhawk (a small, agile hawk with rounded wings) or kestrel (long wings, long tail, hovering).

These two accipiters are the classic hard pair. Audubon's tip is the head: a sharp-shinned hawk's head barely projects, sitting in a dip between the wings, while a Cooper's hawk's head sticks out well beyond the leading edge of the wings. Sharp-shins also flap more; Cooper's hawks glide with forceful, deliberate wingbeats.

The Wildlife Trusts' UK guide gives these in-flight clues:

• Buzzard: broad wings, short tail, the one you will see most.
• Red kite: unmistakable forked tail, reddish-brown body, black-tipped wings with white patches underneath.
• Sparrowhawk: small, rounded or broad wings; males blue-gray above, females brown.
• Kestrel: long wings and long tail, gingery-brown back, hovers.
• Peregrine: the biggest falcon, slate-gray above and white below, black moustache and mask.
• Marsh harrier: the largest harrier, wings held in a distinctive V.
• Osprey: large, dark above and white below, with angled wings.
• Short-eared owl: hunts in daylight; mottled yellowish-brown above, pale below, dark circles around yellow eyes.

Audubon's advice is to spend time at a hawkwatch during migration, where the sheer number of birds gives you the repetition any new skill needs. Our additions: take burst photos when a raptor passes overhead, because one frame usually catches the wings fully spread and the tail fanned; and note the flight style in words (soaring, flapping, hovering, rocking) while you still remember it. NatureLens can suggest the species from an underside photo, with free scans every day.

Research and drafting for this page used AI assistance. Every number, date and claim was then checked against the sources listed below, which were opened and read on 2026-09-25. Where a statement is our own advice rather than a sourced fact, the text says so.