Two Sichuan Takins shoving each other around their enclosure on a rare warm sunny January morning at the St Louis Zoo. This went on for at least 10 minutes or more...with occasional breaks and some cheek-to-cheek time. A youngster was nearby watching and moving occasionally to stay out of there way!

Nikon D800 w/Nikkor VR 28-300mm f/3.5-5.6G

@180mm, f/5.6, 1/160s, ISO 160