The Eurasian Crag Martin catches flying insects as it moves near cliffs and gorges.
It has ash-brown upperparts, paler underparts, and white spots on its square-ended tail.
Eurasian Crag Martins build open cup-shaped nests from mud. During the 2023 breeding season, a survey across Portugal and Spain recorded 2,732 nests of three swallow species at 590 sites, including 120 Crag Martin nests. The species' nests were found at 44 sites, and 85.83% were under bridges.
Crag Martins occupied 36.67% of the nests recorded for their species. Of the nesting sites, 27.27% were abandoned. About 11% of the nests were in natural places such as caves and small cliffs. Nests of the three species sometimes occurred at the same site, and other birds occupied 5.83% of recorded Crag Martin nests. Counting nests that remain on bridges and rocky sites can record how breeding places are used over time.
An extinction-risk assessment has not been added yet.
In a 2023 survey in Portugal and Spain, 85.83% of 120 Eurasian Crag Martin nests were under bridges. The species occupied 36.67% of its recorded nests, and 27.27% of nesting sites were abandoned.