Place: Mêda, north-eastern Portugal
Date: 3 September 2018.
Place: Valhelhas, eastern central Portugal
Date: 4 September 2018.
Place: Aljezur, south-western tip of Portugal
Date: 11 September 2018.
[Delichon urbicum, Family Hirundinidae, Order Passeriformes, Wikipedia Entry: Common house martin]
The sound of the house martin (borrowed from the Xeno-Canto website, recordist Patrik Åberg)
Distribution and sightings of the house martin across the British Isles (borrowed and modified from the Bird Atlas Mapstore).
Marnix's Bird Gallery 