The Nazca booby (Sula granti) is the largest booby in the Galápagos archipelago. Its plumage is almost entirely white, contrasted by dark wings and tail, a black facial mask, and a long bill in orange or pinkish tones. Although much of its life is connected to the ocean, it returns to land to form colonies and breed on different islands across the archipelago.
It is a fish-eating seabird specialized in catching prey at sea. Its streamlined body and long wings allow it to travel over open water in search of food and then return to nesting areas, where both parents take part in incubation and feeding the chick.
Its breeding behavior includes one of the most intense strategies studied in seabirds. The Nazca booby usually lays two eggs, but when both hatch, the older chick typically forces the younger one out of the nest. This phenomenon, known as obligate siblicide, means that normally only one chick survives. Studies suggest that the second egg mainly acts as an “insurance” in case the first one fails.
For many years, the Nazca booby was considered a form of the masked booby, until morphological, ecological, and genetic differences supported its recognition as a distinct species.
Between volcanic rock and open ocean, the Nazca booby reveals a less obvious side of Galápagos: a place where beauty and survival coexist under extraordinarily demanding evolutionary rules.
