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PERU May 2010

From May 02 to 19, 2010, Sheridan Coffey and myself visited north and central Peru with Kolibri Expeditions:

Wedge-rumped Storm-Petrel Oceanodroma tethys - seen on the central coast Pelagic - but check the bottom two pics; is that both subspecies?:

NOTE: in this image the rightmost bird is unusual in that the white rump/utc patch is shorter than typical (compare it to the bird on the left), and there is noticeably more tail visible beyond the white...?:

These seem to be two Wedge-rumped Storm-Petrels based on the extent of white dorsally on both birds - but could they be one of each subspecies?; the expected kelsalli on the left (broader, shorter wings; more-forked tail; extensive white on undertail coverts) and a nominate tethys on the right (narrower, longer wings - especially the hand; less-forked tail; limited white on undertail coverts):