A small accentor rather than a true sparrow, the Dunnock often attracts attention through unobtrusive movement beneath shrubs. Its grey head and chest contrast with a streaked brown back. The registered Douro association is the estuary reserve at Porto and Vila Nova de Gaia, not inland vineyard cruising. Species background source: https://www.rspb.org.uk/birds-and-wildlife/dunnock

Douro
Porto / Vila Nova de Gaia: Douro estuary reserve, Afurada–Cabedelo–São Paio; NOT a claim for inland Régua–Pinhão Viewing: Accessible Porto shore visit with paths and hides; waders/gulls concentrated at low tide and migration/winter. Osprey and Short-eared Owl irregular/seasonal; no guaranteed sightings.

Bar-tailed godwit
Black Redstart