Dusky Crag Martin

Overview

The dusky crag martin (Ptyonoprogne concolor) is a small passerine bird in the swallow family, characterised by its sooty-brown plumage and preference for vertical surfaces. It is a resident breeding species found across South Asia, ranging from the Indian subcontinent to parts of Southeast Asia.

Identification

• Approximately 13 cm (5 in) long with a broad body and a short, square tail featuring small white patches near the tips of most feathers.
• Sooty-brown upperparts and slightly paler underparts, distinguished by a streaked pale dull rufous chin, throat, and foreneck.
• Small bill that is mainly black, brown eyes, and brownish-pink legs; juveniles display rufous grey tips to their plumage.
• Flight is typically slow and leisurely but capable of high speed when required, accompanied by a soft 'chi' contact call and a twittering song.

Habitat

This species inhabits hilly or mountainous country with cliffs, gorges, and caves, typically up to an altitude of 1,800 m, though it reaches 2,000 m in Thailand. It also readily uses man-made structures in lowland areas and urban environments, such as old forts, mosques, bridges, and even light fittings. The range includes the Indian subcontinent, southwestern China, and the northern parts of Thailand, Vietnam, and Laos.

Diet

The dusky crag martin feeds primarily on insects caught in flight, often hunting near rock faces or buildings by flying back and forth. It exploits vertical surfaces, relying on high manoeuvrability and the ability to perform tight turns to catch prey concentrated in the airflow near cliffs. During the breeding season, foraging is concentrated in profitable patches close to the nest.

Did you know?

This small martin is not only hunted by birds of prey like the peregrine falcon but is also recorded in the diet of the greater false vampire bat, Megaderma lyra. Additionally, its population is suspected to be increasing due to the availability of artificial nest sites.