Buller's Shearwater ("Puffinus" bulleri) is a Pacific species of seabird in the family Procellariidae; it is also known as the Grey-backed Shearwater or New Zealand Shearwater. A member of the black-billed wedge-tailed Thyellodroma group, among the larger shearwaters of the proposed genus Ardenna, it forms a superspecies with the Wedge-tailed Shearwater ("P." pacificus).
Adults birds are 46-47 cm in length, with a 97-99 cm wingspan, and have been...
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Buller's Shearwater ("Puffinus" bulleri) is a Pacific species of seabird in the family Procellariidae; it is also known as the Grey-backed Shearwater or New Zealand Shearwater. A member of the black-billed wedge-tailed Thyellodroma group, among the larger shearwaters of the proposed genus Ardenna, it forms a superspecies with the Wedge-tailed Shearwater ("P." pacificus).
Adults birds are 46-47 cm in length, with a 97-99 cm wingspan, and have been recorded to weigh 342-425 g. The upperside of Buller's Shearwater is bluish grey. A blackish stripe runs from the tertiary remiges to the primary wing coverts. The primary remiges are blackish also; the two black areas do not meet at the hand however; the area between them is a rather light gray, under bright light it may appear almost white. With the bird facing upwards, the pattern gives the impression of a broken black "M", with light gray interspersing areas.
The underside is bright white; on the head the upperside's grey extends town to...
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