Common Diving Petrel
Pelecanoides urinatrix
The common diving petrel is a small, plump petrel, 200 to 250 mm (7.9–9.8 in) in length and weighing around 86 to 186 g (3.0–6.6 oz). The plumage is black above and dull white below and it has a relatively short black bill. The wings have thin white strips. The face and neck can be more brown than black. The legs and feet are blue with blackish-brown webbing in between the toes. Unless seen very close, it is almost indistinguishable from the South Georgian diving petrel, P. georgicus.
ID text from Wikipedia, CC BY-SA 4.0
Peruvian Diving Petrel
Pelecanoides garnotii
Peruvian diving petrel is 20–24 cm (7.9–9.4 in) in overall length. Like the rest of the diving petrels it is a nondescript bird, with a dark back and pale belly, and blue feet, and can be separated from the rest of its family only by differences in its beak and nostrils.
ID text from Wikipedia, CC BY-SA 4.0
Where you might meet both
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Play today's Daily BirdPhotos and recordings are credited to their authors under the licence shown. Full profiles: Common Diving Petrel and Peruvian Diving Petrel.