The Gannets or Boobies are black and white or brown and white birds of considerable size, inhabiting the open sea, and living on fish. They have a powerful pointed bill, and the outer nostrils in adults are completely closed. Cervical vertebra; 18. Ambiens, femoro-caudal, and semitendinosus muscles present, the two accessory thigh-muscles absent. No syringeal muscles.
There is only one genus.