Jones Beach State Park, NY Nov 28, 2014
cruddy shot taken through the windshield
I guess it could have been a Thekla lark, which is not common in the northern half of Portugal, but the habitat (in a coastal lagoon area), range and the long beak suggest to me it's a crested lark.
Larks are passerine birds of the family Alaudidae. All species occur in the Old World, and in northern and eastern Australia. Only one, the Horned Lark, is native to North America. Habitats vary widely, but many species live in dry regions.