The best season to observe seabirds is now.
Every day you can see some birds in migration, but, it is best to wait for the northwest winds appear.
It is at this point where the numbers of seabirds in migration, can become huge.
Gannets, Shearwaters, Gulls, Skuas, Waders, Ducks, Auks, Terns…and other birds, not strictly marines, they arrive to northern coasts, and is possible to see Buntings, Wheatears, Pipits, and any time a Rare Bird.
The network of marine bird watchers gets that, all bird records, serve to a better understanding of marine life and a better conservation of seabirds and cetaceans.
Migration counts & captures in Spain and Portugal
Blogs with information about seabirds in northern spanish coast:
More information www.mcbirding.com