Nannopterum auritum – double-crested cormorant, Wally Toevs Pond, Boulder, Colorado, March, 2024. The photographer writes: "Not my best picture ever, but it shows the double crests exceedingly well. According to All about Birds, the crests are seen on adults only during the breeding season, by which they presumably mean both sexes." He thanks Photonix, the god of photography, for enabling digital image processing.
