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Leucophaeus fuliginosus
At the fisherman's wharf area by the pelicans.
CDF - Not more than 400 pairs in the world?!? The rarest gull in the world? Wow! I'm glad I clicked these, because the pelicans were dominating the area. :) I'll truly appreciate this spotting.
While it is easily seen on Galapagos, it probably is the rarest gull in the world. There probably exist not more than 400 pairs, all of them on Galapagos of course. You can see on your second spotting that the species is being studied; this bird is banded.
Thanks Jake. I couldn't decide between Lava or Franklin's. Some of my Galapagos field guides are lame. :)