Did you know that of all the swallow species that occur in Portugal, the Eurasian Crag Martins (𝘗𝘵𝘺𝘰𝘯𝘰𝘱𝘳𝘰𝘨𝘯𝘦 𝘳𝘶𝘱𝘦𝘴𝘵𝘳𝘪𝘴) are the ones that use rocky cliffs the most for nesting?
Eurasian Crag Martins' nests are built with mud and have the shape of a small open cup. These nests can be built from natural structures such as cliffs to human structures such as buildings, bridges or viaducts.
This species can nest alone or form nesting colonies with a few dozen nests, usually spaced apart.
Whenever you come across one of these nests, or that of any other swallow, record it on our website!
Comments