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Sorry that I've had to remove my agreement to this. Hudsonian Whimbrel has now been split from Whimbrel and without details of the rump colour it is not possible to identify this to species.
What a shame. It was so confiding, I'm sure I could have obtained an apposite pic, and Hudsonian would have been a lifer for me.
Sadly none of my unsubmitted pics at Puerto Villamil show the rump either. However, I'll add them to the posting if you think there may be a chance!
Lat/Lng: -0.243, -90.86