Alpine Chough vs Carrion Crow

In short

The most reliable field mark to separate Alpine Chough from Carrion Crow is the bill color: Alpine Chough has a short, bright yellow bill, while Carrion Crow’s bill is long and black. In flight, Alpine Chough shows a longer, more fanned tail and shorter, less rectangular wings, giving a buoyant, acrobatic jizz, while Carrion Crow appears heavier with broader, more rectangular wings and a slower, steadier flight. Plumage is all-black in both, but Alpine Chough is glossier and smaller, with red legs, while Carrion Crow has black legs and a greenish or purplish sheen. Juveniles of both are duller, but the bill color difference remains diagnostic. Calls are also distinct: Alpine Chough gives high, rippling whistles, while Carrion Crow utters deep, croaked 'kraa' notes.

Identification tips

1. Bill color is the most reliable mark: Alpine Chough always has a short, bright yellow bill (dull yellow in juveniles), while Carrion Crow’s bill is always long and black at all ages.
2. Leg color: Alpine Chough has red legs (brownish in juveniles), Carrion Crow has black legs throughout life.
3. Size and build: Alpine Chough is smaller, slimmer, and lighter than Carrion Crow, with a proportionally longer tail and shorter wings. Carrion Crow is larger, stockier, and heavier-billed.
4. Tail shape in flight: Alpine Chough’s tail is longer and more fanned, while Carrion Crow’s tail is squarer and shorter in proportion to body.
5. Wing shape and flight style: Alpine Chough has shorter, less rectangular wings and a buoyant, acrobatic flight with loose, deep wingbeats. Carrion Crow’s wings are broader, more rectangular, and its flight is slower and steadier.
6. Plumage gloss: Both are glossy black, but Alpine Chough is described as glossier, while Carrion Crow may show a green or purple sheen.
7. Juvenile marks: Alpine Chough juveniles are duller with a dull yellow bill and brownish legs; Carrion Crow juveniles have brownish plumage, blue eyes, and a black bill and legs. Bill color remains diagnostic.
8. Voice: Alpine Chough gives high, rippling whistles and warbles, very different from the deep, croaked 'kraa' of Carrion Crow. Listen for high, musical calls for Chough, harsh croaks for Crow.
9. Habitat context: Alpine Chough is found only in high mountains, often above the treeline and around cliffs. Carrion Crow is a lowland and upland generalist, rarely at high elevations.
10. Social behavior: Alpine Choughs are often seen in flocks, especially outside breeding season, and are highly aerial. Carrion Crows are usually solitary or in pairs, sometimes sociable in winter.
11. Perched jizz: Alpine Chough appears more delicate and upright, with a shorter bill and longer tail. Carrion Crow is bulkier, with a heavier bill and a more horizontal stance.
12. No wing panel or trailing edge marks: Neither species shows contrasting wing panels or trailing edges in flight; rely on structure and bill color instead.
13. No seasonal or sex differences: Both species are sexually monomorphic and do not show strong seasonal plumage changes; all field marks apply year-round.
14. Potential confusion with other crows: If you see a black corvid with a yellow bill and red legs, it is Alpine Chough; all-black bill and legs points to Carrion Crow. Jackdaw is smaller and greyer, and Red-billed Chough has a long red bill.
15. When in doubt, check bill and legs first, then flight style and habitat.

Size

Alpine Chough is distinctly smaller and lighter than Carrion Crow: Alpine Chough measures 37–39 cm in length with a 75–85 cm wingspan and weighs 188–252 g, while Carrion Crow is 48–52 cm long, has an 84–100 cm wingspan, and weighs 400–600 g [wikipedia][avonet]. The Chough’s tail is proportionally longer, but overall it is more slender and less robust than the stocky, heavy-billed Carrion Crow.

Plumage

• Juvenile/immature: Both species are all-black, but Alpine Chough juveniles are duller with a dull yellow bill and brownish legs, while Carrion Crow juveniles show brownish plumage and blue eyes, with a black bill and legs. Bill color remains the most reliable mark at all ages.
• Adult: Alpine Chough adults are glossy black with a short, bright yellow bill and red legs. Carrion Crow adults are also glossy black but with a green or purple sheen, a long black bill, and black legs. No contrasting wing panels or trailing edges are noted for either species in flight, so separation relies on structure and bill color rather than wing pattern.
• Flight: Alpine Chough’s wings are shorter and less rectangular, and the tail is longer and more fanned, while Carrion Crow’s wings are broader, more rectangular, and the tail is squarer.

Behaviour

Alpine Choughs are highly aerial, performing acrobatic, buoyant flights with loose, deep wingbeats, and are often seen soaring and maneuvering around cliffs. They are socially monogamous and may nest in loose groups but are not colonial. Carrion Crows are more terrestrial and solitary, with slower, more deliberate wingbeats and a heavier, steadier flight. Crows are often solitary or in pairs, but can be sociable in winter roosts. Alpine Choughs are more likely to be seen in flocks, especially outside breeding season, and are adapted to high-altitude life.

Habitat

Alpine Chough is strictly a high-mountain species, breeding and foraging above the treeline on cliffs and alpine meadows from Spain to Nepal. It may nest at higher altitudes than any other bird. Carrion Crow is a lowland and upland generalist, found in a wide range of habitats including farmland, woodland, cities, and sometimes mountains, but not at the extreme altitudes favored by Alpine Chough. If you are at high elevation above the treeline, Alpine Chough is far more likely; in lowlands or urban areas, expect Carrion Crow.

Voice

Alpine Chough gives high-pitched, rippling 'preep' and whistled 'sweeeooo' calls, as well as rolling 'churr' alarms and quiet warbles. These are very different from Carrion Crow’s deep, guttural, croaked 'kraa' calls, which are delivered in short series with a shoulder-raising, bowing gesture. The Chough’s calls are more musical and less crow-like, while the Crow’s are harsh and resonant.