Sulids measure about 60 to 85 cm (24 to 33 in) in length and have a wingspan around 140 to 175 cm (4.59 to 5.74 ft). They have long, narrow, and pointed wings, and a quite long, graduated, and rather -shaped tail. .
The sulids are distributed mainly in and waters, but they, particularly gannets, are found in regions, too. These birds are not truly seabirds like the related , and usuall. .
Sulids are related to a number of other birds, which all lack external and a , but have all four toes webbed and a . The closest living relatives of the Sulidae are the (cormorants. .
• (1933): Familia Sulidae. In: Handbuch der Palaeornithologie: 284-287 [German]. Gebrüder Bornträger, Berlin.• Mlíkovský, Jirí (2007): Taxonomic identity of Eostega lebedinsky. [pdf]
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