National Geographic : 1974 Mar
was attracted to the eye or its color, the author substituted a wooden model with interchangeable colored disks (bottom right). The chick invariably snapped at the red one, regardless of its position. Bluish at birth, Cooper's hawks' eyes turn yellow, then red as the birds get older. The mature mother, however, protects her eyes by holding her head high. Kamikaze never quite mastered the technique, but fortu nately his charge soon learned that the beak and not the eye held the morsel.