“This is the most unexpected split photo I’ve seen,” writes Enric Sala, a National Geographic explorer-in-residence and the editor of the Pristine Seas assignment, of this image by Your Shot photographer Justin Hofman. “The lonely krill seems to be checking for the presence of the penguin predator. At the same time, we can see the ice and landscape on the surface. It's mostly monochromatic, but the reddish krill attracts one's eye.”