Common Swift vs Eurasian Crag Martin

In short

The Common Swift and Eurasian Crag Martin can be distinguished primarily by their flight silhouette and tail shape. The Common Swift has a more streamlined body with long, pointed wings and a deeply forked tail, whereas the Eurasian Crag Martin has broader wings and a square or slightly forked tail.

Identification tips

1. Look for the tail shape: Common Swift has a deeply forked tail, whereas the Eurasian Crag Martin has a square or slightly forked tail. 2. Observe the wing shape: Common Swift has long, pointed wings, while the Eurasian Crag Martin's wings are broader. 3. Check the plumage: Common Swift is uniformly dark with a small white throat patch, while the Eurasian Crag Martin is mottled brown with pale underparts. 4. Note the behavior: Common Swifts are almost always in flight, whereas Eurasian Crag Martins can often be seen perching. 5. Listen for the calls: Common Swift's call is a high-pitched scream, contrasting with the Eurasian Crag Martin's softer, twittering call.

Size

The Common Swift is generally larger with a wingspan of 42–48 cm compared to the Eurasian Crag Martin's shorter wingspan.

Plumage

The Common Swift is uniformly dark brown with a small off-white throat patch, while the Eurasian Crag Martin has a more mottled brown appearance with pale underparts and a less distinct throat patch.

Behaviour

Common Swifts are almost constantly airborne, especially outside the breeding season, while Eurasian Crag Martins are often seen perching on cliffs or buildings.

Habitat

Common Swifts are found over a wide range of habitats, including urban areas, whereas Eurasian Crag Martins prefer rocky cliffs and mountainous regions.

Voice

The Common Swift has a high-pitched, screaming call, while the Eurasian Crag Martin's call is softer and more twittering.