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In page Eurasian crag martin:

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Crag martins breed on dry, warm and sheltered cliffs in mountainous areas with crags and gorges. The typical altitude is 2,000–2,700 m (6,600–8,900 ft) but breeding occurs up to 5,000 m (16,000 ft) in Central Asia.[2] The Eurasian crag martin's choice of nest sites is very similar to that of Savi's pipistrelle, Hypsugo savii; the bird and the bat often breed in the same locations and have almost identical ranges in Europe.[9][10] In South Asia, migrant Eurasian birds sometimes join with flocks of the dusky crag martin and roost communally on ledges of cliffs or buildings.[11]