Here's the first Ruddy Shelduck or Tadorna ferruginea I've ever seen. According to my field guide, they don't live in Spain, so this one seen floating on a canal at La Granja with some Pochards and one Mute Swan must have been captive?
seen 2 in the reservoir
The Ruddy Shelduck (Tadorna ferruginea) is a member of the duck, goose and swan family Anatidae. It is in the shelduck subfamily Tadorninae.