Birding Peru: Pelagic on August 2, 2007

In 2005 on a pelagic in July from Lima a dark gray bellied breeding plumage Sterna Tern was seen that was tentatively identified as Antarctic Tern, which would be a first for Peru. This one looks quite like the one we saw then, though I recall the bill was shorter than this. So what is this? Can't be an Artic Tern, right? And can South American Tern really be this dark?

(The experts comment that this nevertheless is not an Antartic Tern, but South American Tern, so apparantly they can be this dark underneath)

Short-tailed Shearwater? Naa, don't think so but some of these have quite dark underwings, and short tails...

Another species that would be a new for Peru if I could get a shot of one.

(Again seabird experts point out to me that all these are nothing else than Sooty Shearwater. The dark black wedge from the arm-pit is in fact a good field mark for Soooty)

Northern Giant Petrel was recorded for the first time in Peru in 2002 on a Kolibri Expeditions pelagic. It is now a regular on our pelagics of July to September. This is the first time we found a bird that is not completely brown. Can this one be aged?

Here it is with a juvenile.

Buller's Albatross I only found for the first time in July 2006. This year it has been seen on a number of pelagics in July-September. And even adults and subadults (such as this photo).