The Eurasian crag martin or just crag martin (Ptyonoprogne rupestris) is a small passerine bird in the swallow family. It is about 14 cm (5.5 in) long...

The crag martins are four species of small passerine birds in the genus Ptyonoprogne of the swallow family. They are the Eurasian crag martin (P. rupestris)...

The pale crag martin (Ptyonoprogne obsoleta) is a small passerine bird in the swallow family that is resident in Northern Africa and in Southwestern Asia...

The dusky crag martin (Ptyonoprogne concolor) is a small passerine bird in the swallow family. It is about 13 cm (5 in) long with a broad body and wings...

dry or mountainous areas are often matte brown above (e.g. sand martin and crag martin). The sexes show limited or no sexual dimorphism, with longer outer...

forms, and are now usually split as a separate species, the pale crag martin. The rock martin hunts along cliff faces for flying insects using a slow flight...

The purple martin (Progne subis) is a passerine bird in the swallow family Hirundinidae. It is the largest swallow in North America. Despite its name,...

house martin (Delichon urbicum), sometimes called the common house martin, northern house martin or, particularly in Europe, just house martin, is a migratory...

The sand martin (Riparia riparia), also known as the bank swallow (in the Americas), collared sand martin, or common sand martin, is a migratory passerine...

The brown-throated martin or brown-throated sand martin (Riparia paludicola) is a small passerine bird in the swallow family, Hirundinidae, that is widely...