This is a list of the families, species and sub-species belonging to the Procellariiformes order.
Conservation status - IUCN Red List of Threatened Species:
Order: Procellariiformes Family: Diomedeidae
The albatrosses are a family of 21 species of large seabird found across the Southern and North Pacific Oceans. The largest are among the largest flying birds in the world.
Order: Procellariiformes Family: Procellariidae
The procellariids are the main group of medium-sized "true petrels", characterized by united nostrils with medium nasal septum, and a long outer functional primary flight feather.
Order: Procellariiformes Family: Hydrobatidae
The storm-petrels are the smallest seabirds, relatives of the petrels, feeding on planktonic crustaceans and small fish picked from the surface, typically while hovering. Their flight is fluttering and sometimes bat-like.
Order: Procellariiformes Family: Pelecanoididae
The diving-petrels are relatives of the petrels distinguishable only by small differences in plumage and bill construction. They feed on plankton by pursuit diving.