8.2 SALVIN’S PRION Pachyptila salvini [Prion de Salvin] W 57cm. Separation from 8.1 and 8.3 probably impossible at sea. In the hand shows comb-like lamellae at base of closed bill. Bill grey.
NZ seas.
8.3 ANTARCTIC PRION Pachyptila desolata [Prion de la Désolation] W 63cm. Smaller and bluer bill than 8.1 and – though collar more distinct – not safely separable from 8.2.
Breeds NZ 6,8.
8.4 SLENDER- (or NZThin-)BILLED PRION Pachyptila belcheri [Prion de Belcher] W 56cm. The M on wings less distinct than 8.1–8.3, especially in worn plumage (a). Note small, narrow bill and extensive, distinct white eyebrow, giving pale-faced expression.
NZ seas.
8.5 FAIRY PRION Pachyptila turtur [Prion colombe] W 56cm. Note indistinct facial pattern and narrow M on wings. At sea not safely separable from 8.6.
Breeds NZ 4,5,8.
8.6 FULMAR PRION13 Pachyptila crassirostris [Prion à bec épais] W 60cm. Difficult to separate at sea from smaller-billed 8.5 with similar pale face pattern; best distinction said to be its ‘looping’ flight.
Breeds NZ 4–6,9.
8.7 ANTARCTIC PETREL Thalassoica antarctica [Pétrel antarctique] W 105cm. Note characteristic pattern of upperparts with contrasting white secondaries and tail.
Breeds NZ 8. R
8.8 NORTHERN FULMAR Fulmarus glacialis [Fulmar boréal] W 107cm. Pale morph (b) more blotchy, less solid pearl-grey above and its dark morph (b, only morph yet seen near Hawaii) is darker than the Atlantic ssp glacialis (which does not occur in the area).
Off Ha. R
8.9 SOUTHERN (or NZAntarctic) FULMAR Fulmarus glacialoides [Fulmar argenté] W 118cm. Note diagnostic contrasting wing pattern with white flash on outer wings more contrastingly patterned above than 8.4. From gulls by gliding flight on stiff wings.
Breeds NZ 8.
9 Petrels
9.1 TAHITI PETREL Pterodroma rostrata [Pétrel de Tahiti] W 84cm. Very similar to 10.3, which see. Note the pale stripe down centre of underwings, sharp demarcation on chest and rather pale uppertail coverts. Flies with straight wings held perpendicular to body, alternating deep wingbeats with banking glides and arcs.
Breeds FrPo 3,4,19,
Co 1. R
9.2 FIJI PETREL Pterodroma macillivrayi [Pétrel des Fidji] W 68cm. Characterised by small size and uniform brown plumage. From 12.5 by lack of paler wingbar.
Short, very low, rhythmic croaking. 
