We turned around to head back to Gardiner after Soda Butte Creek. Along the way, one of the photographers spotted movement out across the valley. It was the coyotes alarm-barking because wolves had entered the area. Wolves and coyotes are not friends, as you can tell by the posture of the (smaller) coyote in the back. Soon a pair of wolves chased the coyotes for at least a quarter mile. Both carnivores were interested in the dead bison further west from this location.
Wolf and Coyote
Yellowstone National Park, Wyoming