Why Birds and Bees, Too, Like Good Looks
BEAUTY is only skin deep. How sweet that old chestnut is, equally comforting to the unbeautiful, who know they have so much beyond physical appearance to offer the world, and the beautiful, who, after years of being pursued for their prettiness, really do want to be loved for their inner selves. The only problem with the cliche, say evolutionary biologists, is that it may not be true. In the view of a growing number of researchers who study why animals are attracted to each other, a beautiful face and figure may be alluring not for whimsical esthetic reasons, but because outward beauty is a reasonably reliable indicator of underlying quality. These biologists have gathered evidence from studies of species as diverse as zebra finches, scorpion flies, elk and human beings that creatures appraise the overall worthiness of a potential mate by looking for at least one classic benchmark of beauty: symmetry.