Isabel took this photo in September 2001 near Ortigueira, Galicia (north-west corner of Spain). She was carrying a low resolution digital camera and no binoculars, so she could not see the bird any better than this. She reports a groups of over 10 birds like the one in the picture flying between the ground and the wire when she walked towards them, and then all leaving but one.
I would like to know the species of this bird or, at least, the family. Can you help?