Ah, thát's what it was! I have to admit that I'm not very good at recognizing birds. Mostly, I was surprised to find any bird up there at all, so I took this picture. It wasn't scared, so I presume it was used to all the tourists up there.
"After the first glass, you see things as you wish they were. After the second, you see things as they are not. Finally, you see things as they really are, which is the most horrible thing in the world."
--Oscar Wilde on Absinthe