Swan

Gracias por tu comentario, Nathalie! Me parece que se trata de un Cisne mudo, Cyguns olor. Compara con las fotos en http://en.wikipedia.org/wiki/Coscoroba_S....
El coscoroba no tiene la protuberacia negra en el pico.

Por lo que yo tengo entendido es el Cisne Coscoroba, si es el Coscoroba, si se encuentra en America del Sur!!

This beautiful bird, the Mute Swan, actually does not occur "everywhere". It's originally Eurasian, it's considered an invasive in North America, but it is not found in South America, I think, and I hope not on Galapagos. Unless you saw it there, which would be of interest, please remove it from this mission. Thanks! Pretty nice photos anyway, wherever you took them!