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Genus Pachyptila
Slender-billed Prion - The Slender-billed Prion is a member of the Pachyptila genus and along with the Blue Petrel make up the prions. They are then members of the Procellariiformes order, and they share certain identifying features. First, they have nasal passages that attach to the upper bill called naricorns. Although the nostrils on the Prion are on top of the upper bill. The bills of Procellariiformes are also unique in that they are split into between 7 and 9 horny plates. They produce a stomach oil made up of wax esters and triglycerides that is stored in the proventriculus. This is used against predators as well as an energy rich food source for chicks and for the adults during their long flights.
Fulmar Prion - The Fulmar Prion, Pachyptila crassirostris, is a species of seabird in the Procellariidae family, found in the southern oceans
Antarctic Prion - Prion desolatus Procellaria desolata Gmelin, 1789
Salvin's Prion - The Medium-billed Prion, Pachyptila salvini, also known as Salvin's Prion, is a species of seabird in the petrel family Procellariidae.
Fairy Prion - The Fairy Prion is a member of the Pachyptila genus, and along with the Blue Petrel makes up the Prions. They in turn are members of the Procellariidae family, and the Procellariiformes order. The prions are small and typically eat just zooplankton;
Broad-billed Prion - The Broad-billed Prion, Pachyptila vittata, is a small seabird, but the largest Prion, with grey upperparts plumage, and white underparts. It has many other names that have been used such as Blue-billed Dove-petrel, Broad-billed Dove-petrel, Long-billed Prion, Common Prion, Icebird, and Whalebird.