The Wildfowl and Wetlands Trust is a wonderfully friendly and informational organisation specifically aimed at waterbirds. On a par with the BTO, if you join any Birding associations these are the two to go for.

Birding in Portugal

Quinta do Barranco da Estrada
7665-880 Santa Clara a Velha
Portugal

Email :
Phone : +351 283 933 065
Mobile : +351 938 386 326