High Quality Content by WIKIPEDIA articles! The Blue-footed Booby (Sula nebouxii) is a bird in the Sulidae family, which includes ten species of long-winged seabirds. It is of the genus Sula, which comprises six boobies. It is easily recognizable by its distinctive bright blue feet, which is a sexually selected trait. Males display their feet in an elaborate mating ritual by lifting one and then the other up, while strutting before the female. Both males and females prefer mates with brighter feet and adjust their parental investment based on the attractiveness of their mate.