Thank you for your reply, Ronaldo
I ask the same questions on a Spainish bird watch forum because I guess they will be more familiar with the the juvenile gulls.
For the bird I mention in my first question, I think its plumage look a bit too dark (even when strong light shine on it
http://www.facebook.com/photo.ph ... ;id=100002683708096) for a Herring Gull. The plumage is so dark that looks like that of a Lesser black-backed gull. But then Lesser black-backed gull has yellow leg
http://www.allaboutbirds.org/guide/lesser_black-backed_gull/id while my bird has pinkish leg....so I guess it is a Herring Gull....
By the way, I also saw Golden Oriole, Monk Parakeet, some swifts (one type of them is with white rump), some eagle (I GUESS what I saw are Booted Eagle, Red Kite and Common Kestrel) and some other birds. But I couldn't photograph them, either because they flied away too quickly, or they are too far away to be photographed with my "primitive" camera....haha. anyway, interesting experience for me =]
