This fellow stood out from all the other Northern Gannets in the colony at Stori Karl (Iceland). Having never photographed Gannets before, I wasn't sure what he was, but looking at Sibley and images online I've concluded he must be a third-year bird.
D500, Sigma 150-600C @ 600mm, ISO 800, 1/2500s @ f/7.1 manual, HH. Full-frame, but shifted the bird up in the frame for comp.