SHEEP use facial clues to tell friend from foe in their flock. And like
people, they use the right side of their brain to tell each other apart, a
finding which could provoke more arguments about how our brains became
asymmetrical.
Jon Peirce and his colleagues at the Babraham Institute in Cambridge knew
that external cues such as horns help sheep spot one of their kind. But they
decided to find out if they are also expert at spotting familiar faces in a
flock.
They trained sheep to pick one of two faces at the ends of a Y-shaped path.…
