Most falcons hunt with a dramatic, high-altitude stoop — climb, spot prey, and drop. The Merlin does something different and, in its own way, just as demanding: it chases prey down in fast, direct, low-altitude pursuit, matching a fleeing songbird’s every turn until it runs the target out of options. It’s a hunting style that trades the Peregrine’s spectacular vertical dive for sustained horizontal speed and relentless persistence.
Identification
Overall impression: A small, powerfully built falcon, intermediate in size between the American Kestrel and Peregrine Falcon, with a stockier, more heavily built appearance than the more slender Kestrel — genuinely built like a compact, muscular predator rather than the more delicate-looking Kestrel.
Key field marks:
- Bold, wide dark tail bands — A banded tail pattern with broad dark bands, more pronounced than a Kestrel’s finer tail barring
- Heavily streaked underparts — Dense dark streaking on a pale breast and belly, denser than in most other small North American falcons
- Faint or absent facial “mustache” mark — Unlike the Peregrine Falcon and American Kestrel, which both show a distinct dark facial stripe, Merlins have only a faint, often barely visible facial pattern — a useful negative field mark when trying to rule out the other two species
- Color variation by subspecies — Ranges from pale gray-blue above (males, “Taiga” subspecies) to notably darker, almost blackish above (“Black” Pacific Northwest subspecies) — genuine regional variation that can complicate identification depending on location
Size: 9.4–11.8 inches long, wingspan 20.9–26.8 inches — larger and stockier than an American Kestrel, smaller than a Peregrine Falcon.
Basic Facts
| Feature | Detail |
|---|---|
| Scientific name | Falco columbarius |
| Family | Falconidae (falcons) |
| Length | 9.4–11.8 inches |
| Weight | 5.6–8.5 oz (160–240g) |
| Wingspan | 20.9–26.8 inches |
| Lifespan | Up to 13 years on record |
| Eggs per clutch | 4–5, buff to reddish-brown with darker markings |
| Incubation | 28–32 days |
| Conservation status | Least concern; population increasing |
Hunting Style: Speed and Persistence Rather Than the Dramatic Stoop
Where a Peregrine Falcon typically hunts from significant altitude with a near-vertical dive, Merlins hunt low and fast, flying rapidly and directly at prey — usually small to medium-sized birds — in pursuit flights that can involve extended, high-speed chases with the prey bird making evasive turns that the Merlin matches almost instantly. This horizontal chase-and-match style demands exceptional maneuverability and sustained speed rather than the single decisive strike of a stoop.
Merlins also frequently hunt from a concealed perch, launching a surprise attack on unsuspecting prey passing nearby rather than actively searching from altitude — a more ambush-oriented approach than the Peregrine’s characteristic soaring search pattern.
Diet
Small to medium-sized birds make up the overwhelming majority of the diet — sparrows, shorebirds, and similarly sized songbirds are typical prey, caught almost entirely in flight. Merlins occasionally take large insects (particularly dragonflies) and, less commonly, small mammals, but the species’ hunting anatomy and behavior are clearly specialized around aerial bird pursuit rather than a broad, opportunistic diet.
The Name’s Falconry History
“Merlin” comes from an Old French/Anglo-Norman term historically used in falconry, where the species has a long documented history as a hunting bird favored specifically by medieval European noblewomen — smaller and lighter than the falcons typically flown by men, but still a genuinely effective hunting bird for smaller quarry. This historical falconry association is part of why the species carries a distinct common name entirely unrelated to its appearance or habitat, unlike many bird names.
Nesting
Unlike some falcons that use bare cliff ledges or scrapes, Merlins commonly nest in old stick nests built by other birds — particularly crows, magpies, and hawks — rather than constructing their own from scratch. This reliance on repurposed nests is shared with several other raptor species and reflects a broader pattern among falcons, which generally don’t build nests themselves.
Range and Population Trends
Breeds across the boreal forest regions of Canada and Alaska, with additional populations in parts of the northern US. Migrates through and winters across most of the continental United States, Mexico, and into Central and northern South America.
Unlike several other raptor species that suffered severe declines during the DDT era, Merlin populations have shown a notable increase in recent decades, including a documented expansion into urban and suburban areas across parts of their range — a pattern that echoes, on a smaller scale, the urban colonization seen in Peregrine Falcons.
Merlin vs American Kestrel vs Peregrine Falcon
| Feature | Merlin | American Kestrel | Peregrine Falcon |
|---|---|---|---|
| Size | Medium-small, stocky | Small, slender | Large |
| Facial mustache mark | Faint or absent | Bold, double stripe | Bold, single wide stripe |
| Hunting style | Fast horizontal chase | Hover-hunt over fields | High-altitude stoop dive |
| Primary prey | Small-medium birds | Insects, small mammals | Birds, caught in flight |
FAQ: Merlin
How does a Merlin hunt differently from a Peregrine Falcon?
Merlins hunt with fast, low, horizontal chase flights that match prey’s evasive turns, rather than the Peregrine’s dramatic high-altitude vertical stoop dive.
How do you tell a Merlin from an American Kestrel?
Merlins lack the Kestrel’s bold facial mustache stripe and are noticeably stockier and more powerfully built overall.
Where does the name “Merlin” come from?
An Old French/Anglo-Norman falconry term — the species has a long documented history as a hunting bird favored by medieval European noblewomen.
Are Merlin populations declining?
No — unlike many raptors affected by the DDT era, Merlin populations have increased in recent decades, including expansion into urban and suburban habitat.
For more on falcons, see our guides on Peregrine Falcon and American Kestrel.
MD Imdadul Haque is the founder of BirdzFly, a research-backed resource on North American backyard birds. Drawing on years of independent study into bird identification, behavior, and migration patterns, he writes in-depth guides designed to help US birders understand the species in their own backyards — from common feeder visitors to seasonal migrants passing through.
