By Susan Milius
Male guppies sporting a tad more orange on one side of their bodies than on the other tend to flash that better side at females.
That’s the conclusion of a new study of asymmetric male guppies flirting with females in adjoining tanks, says Mart R. Gross of the University of Toronto. In reaction to a dead female suspended in a tank, males in a neighboring tank still courted but didn’t favor their good sides.