Identification
Birds that look like hawks (a rule that ends the confusion)
The single most useful thing in raptor identification is the wing-shape rule. Once you have it, you can sort a soaring bird into one of four families at fifty metres without binoculars.
- Broad wings, rounded tips. Hawk or eagle.
- Long pointed wings. Falcon.
- Long narrow wings held in a shallow V. Harrier.
- Bent at the wrist, white underside, slow flap. Osprey.
That is the whole rule. The rest is texture.
Why it works
The wing shape is a function of how the bird hunts. Hawks ambush prey from a perch or a soar, which needs lift, slow flight and tight turning - hence broad rounded wings. Falcons chase prey in open air at high speed, which needs penetration and minimum drag - hence long pointed wings. Harriers quarter low over open ground listening for voles, which needs slow controlled drift - hence long narrow wings held high. Ospreys hover and dive feet-first into water for fish, which needs a long arm and a strong wrist for the recovery - hence the kinked silhouette.
Genetics confirms what the wings already told you. The 2008 Hackett et al genomic study of bird relationships found that falcons are not closely related to hawks. They are closer to parrots and songbirds. The two groups converged on raptor lifestyle from different starting points. Wing shape is the visible record of that convergence.
The birds the rule sorts
| Wing shape | Family | Common species |
|---|---|---|
| Broad, rounded | Accipitridae (hawks, eagles, kites) | Red-tailed Hawk, Cooper’s Hawk, Bald Eagle, Red Kite |
| Long, pointed | Falconidae | Peregrine, American Kestrel, Merlin |
| Long, narrow, held in V | Accipitridae (harrier subgroup) | Northern Harrier, Hen Harrier |
| Bent at wrist, white below | Pandionidae | Osprey (only one species globally) |
The lookalikes worth knowing
Cooper’s Hawk is a hawk with shorter rounded wings and a long banded tail. It catches birds at feeders. It is the most common reason a backyard bird suddenly disappears in a flash of grey.
Northern Goshawk is a Cooper’s Hawk doubled in size. Forest specialist, will hunt grouse and rabbits, almost never seen in suburbs.
Northern Harrier is the easiest of all to learn. Flies low and slow, holds wings in a shallow V, has a white patch on the rump that flashes in sunlight. Once you have seen one harrier you will never confuse it with anything else.
American Kestrel is the small falcon you see hovering over highway verges in summer. Often mistaken for a hawk because of the colour. Look at the wings.
Common Buzzard is Europe’s Red-tailed Hawk equivalent. Highly variable plumage from near-white to dark chocolate. Same shape.
Black Kite has a forked tail. Once you see the fork you cannot mistake it for anything else.
Where the rule fails
Two cases, both rare.
- A Cooper’s Hawk in fast direct flight between trees looks falcon-shaped from below. Wait for it to soar.
- A Peregrine in slow gliding flight at a long distance can look broad-winged. Wait for it to accelerate, which it will.
In both cases the rule survives a few extra seconds of patience.
The owl problem
Owls are not in the rule because they fly mostly at night and you almost never see them in flight long enough to argue with. By daylight you would be looking at silhouette, not shape - a flying Great Horned Owl looks like a flying owl, period.
For owls see Birds that look like owls.
