Slight wedge-shaped tail, here where it is held close together. But no doubt about the species, since the necessary field marks are present. And it was the only shearwater species we saw this day.
That this bird is a pink-footed I have no reason to doubt, but try to compare it with 2591 photo 5 and see how much it resembles the bird I there call a Wedge-tailed. Hopefully it only shows how similarly they can look, and not that I made a mistake about the Mexican bird...
Light morph with a Sooty Shearwater in the background. The Sooty looks somewhat compact for a Sooty, but the bill, which looks uni-colored, and the longish tail exclude both Wedge-tailed and Pink-footed, dark morph. Both of which would also be rare observations.
It would be tempting to call this bird a juvenile because of the neat and perfect plumage. However, the species lays eggs in December and the young don't leave the nest until April-May. Therefore it has to be an adult in perfectly fresh plumage. See the other photos from this day, notice than none of these birds show a similarly perfect plumage. A bit strange...