Tony Heald / Hippopotamus {Hippopotamus amphibius} territorial defense at water edge, Chobe national park, Botswana.

Tony Heald / Glaucous Gull (Larus hyperboreus) taking off from ice, Svalbard Norway, July.

Tony Heald / African wild dog (Lycaon pictus) portrait. Chobe National Park Botswana. Digitally enhanced sepia image.

Tony Heald / Elephant (Loxodonta africana) babies playing, Etosha National Park,Namibia.

Tony Heald / Hippopotamus (Hippopotamus amphibius) splashing in pool in evening light. Mana Pools National Park, Zimbabwe.

Tony Heald / African elephant (Loxodonta africana) feeding on grasses, Chobe River, Chobe National Park, Botswana. May.

Tony Heald / African lion (Panthera leo) three subadults resting on the road, one snarling, Central Kalahari Game Reserve, Botswana

Tony Heald / Giant Otter (Pteronura brasiliensis) adult with young in water, Pantanal, Brazil

Tony Heald / Black skimmer (Rynchops flavirostris) fishing by skimming along water surface, Pantanal, Brazil

Tony Heald / Junglefowl (Gallus gallus) male, Kaziranga National Park, Assam, India, March.

Tony Heald / Hanuman langur (Semnopithecus entellus) baby next to mother, Bandhavgarh National Park, India.

Tony Heald / Bengal tiger (Panthera tigris tigris) walking, Bandhavgarh National Park, India.