Eric Dragesco / Gobi Bear (Ursus arctos gobiensis) paw prints / tracks in desert sand, Gobi National Park, Mongolia

Matthias Breiter / Grizzly Bear (Ursus arctos horribilis) front and back paw prints, Katmai National Park, Alaska

Steven David Miller / Dingo (Canis dingo) paw prints in the sand, Kingfisher Bay, Fraser Island, Queensland, Australia

Nick Garbutt / Tourist in jeep looking at pug / paw marks of female Bengal Tiger {Panthera tigris tigris} along a forest track, Kanha National Park, Madhya Pradesh, India.

Nick Garbutt / Pug / Paw mark of female Bengal Tiger {Panthera tigris tigris} along a forest track, Kanha National Park, Madhya Pradesh, India.

Patricio Robles Gil / Grey wolf tracks in dried mud {Canis lupus} Yukon, Canada

Staffan Widstrand / Tracks of Grey (Arctic) wolf {Canis lupus} in snow. Ellesmere, Canada.