Wolf tracks in dark grey sand on the shore of the Yellowstone river in Yellowstone National park

• wolf, nature, animal, eyes, teeth, natural, mammal, wildlife, timber, canine, predator, fur, prey, predatory, quadruped, attention, creature, furry, guard, attentive, beast, undomesticated, gray, bite, fierce, stare, savage, perceptive, living, kill, grey, hairy, watchful, untamed, looking, observing, observant, wild
• ID: 123230080
• 3957 x 2638 pixels