Avión isabel meridional

The large rock martin (Ptyonoprogne fuligula), also known as the southern crag-martin, is a small passerine bird in the swallow family that is resident in southern Africa. It was formerly considered to be conspecific with the red-throated rock martin. It breeds mainly in the mountains, but also at lower altitudes, especially in rocky areas and around towns, and, unlike most swallows, it is often found far from water. It is 12–15 cm (4.7–5.9 in) long, with mainly brown plumage, paler-toned on the upper breast and underwing coverts, and with white "windows" on the spread tail in flight. The sexes are similar in appearance, but juveniles have pale fringes to the upperparts and flight feathers. The former northern subspecies are smaller, paler, and whiter-throated than southern African forms, and are now usually split as a separate species, the pale crag martin. The large rock martin hunts along cliff faces for flying insects using a slow flight with much gliding. Its call is a soft twitter. The large rock martin builds a deep bowl nest on a sheltered horizontal surface, or a neat quarter-sphere against a vertical rock face or wall. The nest is constructed with mud pellets and lined with grass…