Even as winter's snow persists on the cliffs of Bird Rock and Bonaventure Island in the Gulf of St. Lawrence, vast flocks of large seabirds arrive to establish their nests upon these wind-swept ledges. These are Northern Gannets (Morus bassanus), the sole members of the gannet and booby family, Sulidae, found in northern latitudes. As the largest seabirds in the North Atlantic, they can reach lengths of up to 100 centimeters.
These birds breed on islands across Canada, Greenland, Iceland, and northeastern Europe. Two slightly smaller related species inhabit the Southern Hemisphere: the Australasian Gannet (M. serrator), which nests on coastal areas around Tasmania and New Zealand, and the Cape Gannet (M. capensis), found on islands off South Africa. The Sulidae family shares close evolutionary ties with pelicans and cormorants.
Adult gannets display predominantly white plumage with distinctive black-tipped flight feathers. They possess streamlined beaks and tapered tails. Being exceptional fliers and skilled gliders, they spend the majority of their existence above marine waters. They hunt fish and squid by plunging into the ocean from considerable heights with their wings partially folded, establishing massive nesting colonies on cliff faces.
Their tropical counterparts, the boobies, similarly inhabit marine environments and employ high-altitude diving techniques to capture fish and squid. Some booby species also snatch flying fish directly from the air. Ranging from 65 to 85 centimeters in length, boobies characteristically have elongated bills and slender wings. They are colonial nesters, with all species being exclusively tropical.
Notable species include the widely distributed Red-footed Booby (Sula sula), Brown Booby (S. leucogaster), and Masked (or Blue-faced) Booby (S. dactylatra), found across the Atlantic, Pacific, and Indian Oceans. The Blue-footed Booby (S. nebouxii) inhabits Pacific waters from southern California to northern Peru, including the Galápagos Islands.
