Ynghylch

The house martin is a common summer visitor to the UK, arriving in April and leaving in October. It builds mud nests, sometimes in small colonies, under ledges, on cliffs and, as their name suggests, under the eaves of houses. Both males and females help to build the nest, collecting mud from streams and ponds and building up layers with bill-sized pellets. House martins are commonly found in towns and villages, as well as in agricultural areas. They feed on flying insects and aphids.