White-necked petrel

Description

This species resembles the Vanuatu petrel,P.occulta,but is slightly larger at 43 centimetres (17 in) in length,95–105 centimetres (37–41 in) in wing span and 380–545 grams (13.4–19.2 oz) in weight.It has a black cap,white rear neck,dark grey back,wings and tail,and a darker rump.The underparts are white with dark bases on the primary feathers.The upperparts of worn birds become darker.It is very difficult to separate the white-necked petrel from the Vanuatu petrel at sea.