These emperor penguin chicks are just chillin’ on a warm summer’s day (*) on the sea ice. As close as they were to each other last November when this image was taken, they’re probably much closer together now. In winter, as temperatures plummet to -60 F, they press tightly against each other in a mass huddle to maximize warmth.

(*) “Warm” is relative, of course. Here, 25 F is considered pretty warm.