The Northern gannet (Morus bassanus) is a seabird and the largest member of the gannet family, Sulidae. It has the same colours as the Australasian gannet and is similar in appearance. Nesting in colonies as large as 60,000 pairs on both sides of the north Atlantic this bird undertakes seasonal migrations and is a spectacular high-speed diver. The Bass Rock in the Firth of Forth is the world's largest colony of Northern gannets.