Cheryl-Samantha Owen / Blacktip reef sharks (Carcharhinus melanopterus) group swimming in shallow turquoise sea, Aldabra Atoll, Seychelles, Indian Ocean

Cheryl-Samantha Owen / Blacktip reef sharks (Carcharhinus melanopterus) split level view of group hunting at dusk, Aldabra Atoll, Seychelles, Indian Ocean

Juergen Freund / Split-level shot of Black tip reef shark (Carcharhinus melanopterus) patrolling the shallows. Misool, Raja Ampat, West Papua, Indonesia, January 2010.

Juergen Freund / Black tip reef shark (Carcharhinus melanopterus) patrolling the shallows. Misool, Raja Ampat, West Papua, Indonesia, January 2010.

Juergen Freund / Split-level shot of Black tip reef shark (Carcharhinus melanopterus) patrolling the shallows. Misool, Raja Ampat, West Papua, Indonesia, January 2010

Wild Wonders of Europe / Campbell / Female Bottlenosed dolphin (Tursiops truncatus) with calf surfacing, patrolling rip-current searching for salmon / sea trout, Moray Firth, Nr Inverness, Scotland, May 2008

Georgette Douwma / Tiger shark patrolling shallow water for egg laying turtles. Australia {Galeocerdo

Doug Perrine / Blacktip shark patrolling {Carcharhinus limbatus} Walkers Cay, Bahamas, Caribbean Sea (Non-ex).

Doug Perrine / Silhouette of Blacktip shark patrolling {Carcharhinus limbatus} Walkers Cay, Bahamas, (Non-ex).

Ann & Steve Toon / Black rhinoceros (Diceros bicornis) orphaned calf with security officer John Tanui at Lewa Wildlife Conservancy, Laikipia, Kenya, Africa, September 2012

Ann & Steve Toon / Armed anti-poaching patrol, Lewa Conservancy, Laikipia, Kenya, September 2012

Ann & Steve Toon / Armed anti-poaching patrol out in Lewa Conservancy, Laikipia, Kenya, September 2012

Anup Shah / Western chimpanzee (Pan troglodytes verus) community emerging from the undergrowth to walk along a path, Bossou Forest, Mont Nimba, Guinea. December 2010.

Staffan Widstrand / The anti poaching patrol in action, walking across landscape, iMfolozi National Park, South Africa October 2011

Cheryl-Samantha Owen / Blacktip reef sharks (Carcharhinus melanopterus) underside view of group patrolling shallow waters, Aldabra Atoll, Seychelles, Indian Ocean

Cheryl-Samantha Owen / Blacktip reef shark (Carcharhinus melanopterus), Aldabra Atoll, Seychelles, Indian Ocean

Cheryl-Samantha Owen / Blacktip reef sharks (Carcharhinus melanopterus) in shallow above sandy seabed, Aldabra Atoll, Seychelles, Indian Ocean

Andy Rouse / African lion (Panthera leo) male lion, one of Notch's sons called Bob, Masai Mara National Reserve, Kenya

Andy Rouse / African lion (Panthera leo) male lion, one of Notch's sons called Bob, Masai Mara National Reserve, Kenya

Andy Rouse / African lion (Panthera leo) the famous Notch and son, Masai Mara National Reserve, Kenya

Suzi Eszterhas / Chimpanzee (Pan troglodytes) group looking for monkeys in trees while out on hunting patrol, western Uganda

Suzi Eszterhas / Chimpanzee (Pan troglodytes) pair on tropical forest path, western Uganda

Tui De Roy / African Wild Dog (Lycaon pictus) pack patrolling in grassland, Mpala Research Centre, Kenya

Roland Seitre / Rangers patrolling the Northern Rangelands Trust. Ishaqbini Reserve, Kenya, 2009.

Konrad Wothe / Chimpanzee (Pan troglodytes) male on patrol, Mahale Mountains National Park, Tanzania, East Africa

Brent Stephenson / South Polar Skua (Stercorarius / Catharacta maccormicki) patrolling a Gentoo Penguin (Pygoscelis papua) rookery, with Penguins warning it off. Aitcho Island, South Shetland Islands, Antarctica, Decemb...

Juergen Freund / Rangers on their patrol boat patrolling the protected waters. Misool, Raja Ampat, West Papua, Indonesia, January 2010.

Juergen Freund / Split-level shot of Black tip reef shark (Carcharhinus melanopterus) patrolling the shallows. Misool, Raja Ampat, West Papua, Indonesia, January 2010.

Juergen Freund / Black tip reef sharks (Carcharhinus melanopterus) patrolling the shallows. Misool, Raja Ampat, West Papua, Indonesia, January 2010.

Juergen Freund / Coral hawkfish (Cirrhitichthys oxycephalus) patrolling a fan coral. Hawkfish often hunt pygmy seahorses that live on this fan. Misool, Raja Ampat, West Papua, Indonesia

Juergen Freund / Black tip reef shark (Carcharhinus melanopterus) patrolling the shallows. Misool, Raja Ampat, West Papua, Indonesia.

Juergen Freund / Black tip reef shark (Carcharhinus melanopterus) patrolling the shallows. Misool, Raja Ampat, West Papua, Indonesia

Suzi Eszterhas / Pack of African Wild Dogs (Lycaon pictus) patrolling territory. Endangered Species. Northern Botswana, Africa, August.

Alex Mustard / A large bull California sealion (Zalophus californianus) patrolling his territory, blowing bubbles as he marks the boundary by vocalising. Los Islotes, La Paz, Baja California, Mexico. Sea Of Cortez,...

Andy Sands / Bee killer wasp / Beewolf (Philanthus triangulum) male flying low patrolling his territory near his burrow, London, England, UK

Kristel Richard / The Garde Républicaine (Republican Guard), part of the French Gendarmerie, mounted on Selle Français horses, patrolling the streets, Caserne des Célestins, Paris, France. October 2009

Wild Wonders of Europe / Campbell / Two Bottlenosed dolphins (Tursiops truncatus) patrolling rip-current, Moray Firth, Nr Inverness, Scotland, June 2008

Wild Wonders of Europe / Campbell / Female Bottlenosed dolphin (Tursiops truncatus) with calf surfacing, patrolling rip-current searching for Salmon / Sea trout, Moray Firth, Nr Inverness, Scotland, May 2008

Roger Powell / Great Bustard {Otis tarda} male patrolling territory, Evora, Portugal

Roger Powell / Great Bustard {Otis tarda} male patrolling territory, Castro Verde plains, Portugal

Theo Allofs / Asian Elephant (Elephas maximus) worker on chain, this animal is used for carrying tourists and patrolling wildlife in Kaziranga National Park, India

Kim Taylor / Photographer Kim Taylor setting up a fully automated system to photograph a dragonfly patrolling over a pond. Surrey, UK

Gary K. Smith / Four-spotted chaser {Libellula quadrimaculata} in flight, patrolling freshwater habitat, Norfolk UK, June

Mark Moffett / Army Ant (Eciton i) two soldiers or major workers patrolling edge of trail, Barro Colorado Island, Panama

Piotr Naskrecki / Ghost Crab (Ocypode quadrata) patrolling a beach on the Pacific coast of Costa Rica in search of small animals or carcasses of fish washed ashore, Costa Rica

Tui De Roy / Brown Pelican (Pelecanus occidentalis) patrolling seashore in search of fish schools, Floreana Island, Galapagos Islands, Ecuador

Tui De Roy / Brown Pelican (Pelecanus occidentalis) patrolling seashore in search of fish schools, Floreana Island, Galapagos Islands, Ecuador

Jabruson / Guards riding domesticated African elephants {Loxodonta africana} Garamba NP, Congo

Nick Garbutt / Male Bengal Tiger {Panthera tigris tigris} running and patrolling territory, Bandhavgarh National Park, Madhya Pradesh, India.

Nick Garbutt / Female Bengal Tiger "Laxmi" {Panthera tigris tigris} sniffing scent on tree trunk while patrolling territorial boundaries, Bandhavgarh, India.

Anup Shah / Male Lions walking {Panthera leo} Masai Mara, Kenya

Doug Perrine / Tiger shark {Galeocerdo cuvieri} patrolling sea bed, South Africa

Doug Perrine / Dorsal fins of Great white shark {Carcharodon carcharias} patrolling coastal fur seal colony {Arctocephalus p pusillus} Dyer Island, South Africa

J Foott / Grey reef shark {Carcharhinus amblyrhynchos} patrolling over coral reef, French polynesia, Pacific Ocean

JEFF FOOTT / Two Blacktip reef sharks {Carcharhinus melanopterus} patrolling shallow water, surrounded by other fish, Rangiroa, French Polynesia

Jabruson / Domesticated African elephants (Loxodonta africana) ridden by forest guards on patrol at sunset, Garamba NP, Democratic Republic of Congo

Jabruson / Domesticated African elephants (Loxodonta africana) ridden by forest guards on patrol, Garamba NP, Democratic Republic of Congo

Flip Nicklin / Cavalla (Caranx sp) school patrolling reef off of Cocos Island, Costa Rica

Flip Nicklin / Cavalla (Caranx sp) patrolling reef off of Cocos Island, Costa Rica

PREMAPHOTOS / Carpenter bee male patrolling territory (Xylocopa sp.) Kenya, Africa - guards its territory round bush.

Tui De Roy / Maned Wolf (Chrysocyon brachyurus) patrolling huge territory in open Cerrado grassland habitat, Serra de Canastra National Park, Brazil

Tui De Roy / Okarito Kiwi (Apteryx rowi) male affectionately known as Scooter patrolling his territory, Okarito Forest, Westland, South Island, New Zealand

Tui De Roy / Okarito Kiwi (Apteryx rowi) male affectionately known as Scooter patrolling his territory, Okarito Forest, Westland, South Island, New Zealand

Tui De Roy / Galapagos Sea Lion (Zalophus wollebaeki) dominant bull patrolling his territory, Punta Espinoza, Fernandina Island, Galapagos Islands, Ecuador

Tui De Roy / Maned Wolf (Chrysocyon brachyurus) patrolling huge territory in Cerrado grassland habitat, Serra de Canastra National Park, Brazil

Tui De Roy / Maned Wolf (Chrysocyon brachyurus) patrolling huge territory in open Cerrado grasslands habitat, Serra de Canastra National Park, Brazil

Jeff Rotman / Caribbean reef sharks patrolling their territory {Carcharhinus perezi} Bahamas

Doug Perrine / Blacktip shark patrolling {Carcharhinus limbatus} Walkers Cay, Bahamas, Caribbean Sea (Non-ex).

Doug Perrine / Blacktip sharks patrolling {Carcharhinus limbatus} Walkers Cay, Bahamas, Caribbean Sea (Non-ex).

Doug Perrine / Tiger shark {Galeocerdo cuvieri} South Africa, Indian Ocean (Non-ex).

Christian Ziegler / Game wardens going out on night patrol, Barro Colorado Island, Panama

Stephen Belcher / Rhino protection unit personnel patrolling in Way Kambas National Park, Sumatra, Indonesia

Stephen Belcher / Rhino protection unit personnel patrolling in Way Kambas National Park, Sumatra, Indonesia

Stephen Belcher / Rhino protection unit personnel patrolling in Way Kambas National Park, Sumatra, Indonesia

Stephen Belcher / Rhino protection unit personnel patrolling in Way Kambas National Park, Sumatra, Indonesia

Stephen Belcher / Rhino protection unit personnel patrolling in Way Kambas National Park, Sumatra, Indonesia

Stephen Belcher / Rhino protection unit personnel patrolling in Way Kambas National Park, Sumatra, Indonesia

Stephen Belcher / Rhino protection unit personnel patrolling in Way Kambas National Park, Sumatra, Indonesia

Stephen Belcher / Rhino protection unit personnel patrolling in Way Kambas National Park, Sumatra, Indonesia

Stephen Belcher / Rhino protection unit personnel entering Way Kambas National Park at the beginning of a patrol, Way Kambas National Park, Sumatra, Indonesia

Nature Production / Ayu Fish {Plecoglossus altivelis altivelis} patrolling its territory, Koza River, Wakayama, Japan

Flip Nicklin / Cavalla (Caranx sp) and Squirrelfish (Holocentrus sp) schools patrolling reef, Cocos Island, Costa Rica

Tui De Roy / Komodo Dragon (Varanus komodoensis) patrolling regular haunts through monsoon forest, Komodo Island, Indonesia

Anup Shah / Male Bengal tiger beside lake {Panthera tigris tigris} Ranthambhore NP Rajasthan