Penguins have rare ability to recognise each other's faces and voices
Penguins have rare ability to recognise each other's faces and voices
African penguins identify each other using unique features of their physical appearance and vocal calls – making them the second group of birds after crows known to do so
African penguins identify each other using unique features of their physical appearance and vocal calls – making them the second group of birds after crows known to do so