Bull Moose, AlaskaDuring the fall rut in Alaska bull moose move through the trees, grunting and sniffing the air for the scent of receptive cows. Their necks swell with testosterone, and they may thrash saplings or engage in head-to-head battles with rival bulls to assert dominance. I kept my distance, for the most part, as this guy zeroed in on a nearby cow. Nikon D810 with Nikkor 70-200mm lens (at 140mm) ISO 800, f/4 at 1/1000th of a second.