88 HOW TO IDENTIFY NEW ZEALAND BIRDS 
Procellariitormes. 
SHEARWATERS 
11 in. Allied or Gould’s Shearwater (Puffinus assimilis). 
Differs from Forster’s Shearwater in having under parts 
white, also small size,and absence of brown in the plumage, 
which is a distinct ashy black with greyish patch on chest. 
14.5 in. Forster’s Shearwater (Puffinus gavia). Larger 
than Gould’s Shearwater. Fluttering flight when the white 
patch behind always shows conspicuously. 
18 in. Sombre Shearwater or New Zealand Mutton Bird 
(Neonectris or Puffinus griseus). May be distinguished by 
white feathers under wings. 
18.5 in. Ashybacked or Longtailed Shearwater (Thyello- 
droma or Puffinus bullert). Black marking like W. when 
wings extended, long bill and dark wedge shaped tail con- 
trasting with slate grey back. Rare. 
19 in. Pink-footed Shearwater (Hemipuffinus carneipes). 
Uniform dark plumage, light patch in centre of bill, re- 
mainder being black. 
PETRELS 
6.7 in. Grey-backed Storm Petrel (Garrodia nereis). Grey 
underparts, tail tipped black. Underparts white with grey 
streaks on sides. 
6.8 in. Yellow-webbed or Wilson’s Storm Petrel 
(Oceanites oceanicus). Uniform black plumage. Completely 
encircling white patch near tail. Yellow webbed feet with black. 
toes. 
7.5 in. Black-bellied Storm Petrel (Fregetta tropica). 
Broad mark down centre of abdomen, contrasting to white 
on flank when bird is in flight. Not common. 
8 in. White-faced Storm Petrel (Pelegodroma marina). 
Distinctive black and white markings, not so plentiful as 
Black-bellied Storm Petrel. . 
8 in. Diving Petrel (Pclecanoides wrinatrix). Steel black 
upper parts, underparts white. Fly badly but dive like 
Grebe, unlike other Petrels. 
10 in. Dove Petrel (Prion spp.). These birds cannot be 
distinguished one from another on the wing. Swallow and 
Snipe-like flight. Pale blue upper parts streaked in zig- 
zag fashion with brown. 
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