Laurie Hedges / Bison (Bison bison) bull kicking up dust, urinating and then rolling on the ground for scent, Montana, USA, August.
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Marie Read / American bittern (Botaurus lentiginosus) calling / booming in a cattail marsh to mark territory, Salt Alkaline Lake, Kidder County, North Dakota, USA, June.
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Vishal Jadhav / Indian jackal (Canis aureus indicus) pair howling, Maharashtra, India, September.
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Simon Littlejohn / Common kingfisher (Alcedo atthis) perched outside its nest, opening its wings and beak in an aggressive display to a Common blackbird (Turdus merula) which eventually flies away, River Stour, Dorset,...
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Sergey Gorshkov / Siberian tiger (Panthera tigris altaica) female territorial marking by rubbing cheek against ancient Manchurian fir tree, Land of the Leopard National Park, Far East Russia, November. Taken with remo...
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David Pattyn / Mute swan (Cygnus olor) in a threathening territorial pose and attacking a rival, Lake Geneva, near Geneva, Switzerland, March
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Oscar Dewhurst / Eurasian coot (Fulica atra) males fighting over territory. London, England, UK. December.;
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Marie Read / American avocets (Recurvirostra americana) two during aggressive (territorial) encounter, Bear River Migratory Bird Refuge, Utah, USA, May.
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Marie Read / Canada geese (Branta canadensis) two during territorial fight in early spring, Ithaca. New York, USA
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Marie Read / Wood Ducks (Aix sponsa), females behave aggressively toward a male (second from right) that is trying to join them on a floating log, autumn, New York, USA, October.
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Matthew Maran / Red Fox (Vulpes Vulpes) patrolling the allotment
North London, England, UK, September.
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Jack Dykinga / Aurora Borealis reflected in Polar Lake, conifers silhouetted at edge. Near Great Slave Lake, Northwest Territories, Canada. September 2018.
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Jack Dykinga / Aurora Borealis display above conifers and Polar Lake. Near Great Slave Lake, Northwest Territories, Canada. September 2018.
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Jack Dykinga / Aurora Borealis reflected in Polar Lake, wetland and conifers silhouetted along shore. Near Great Slave Lake, Northwest Territories, Canada. September 2018.
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Eric Baccega / Small herd of Muskox (Ovibos moschatus) feeding in a blizzard, Banks Island, Northwest Territories, Canada.
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David Noton / Autumnal foliage of Fireweed (Epilobium angustifolium) Kluane National Park, Yukon Territories, Canada, September.
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David Noton / Aurora Borealis (Northern Lights) over the Klondike River, Yukon Territories, Canada, September 2013.
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David Noton / Green waters of Emerald Lake, near Carcross, Yukon Territories, Canada, September 2013.
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Andy Rouse / Dahl's Aquatic frog (Litoria dahli) in water,
Bamarru Plains, North West Territories, Australia
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Andy Rouse / Dingo (Canis lupus dingo) Kakadu National Park, North West Territories, Australia
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Andy Rouse / Agile wallabies (Macropus agilis) sparring and fighting, Bamarru Plains, Northern Territories, Australia
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Andy Rouse / Agile wallabies (Macropus agilis) sparring and fighting, Bamarru Plains, Northern Territories, Australia
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Andy Rouse / Agile wallaby (Macropus agilis) Bamarru Plains, Northern Territories, Australia
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Terry Whittaker / 2020VISION / Pine marten (Martes martes) 4-5 month kit in caledonian forest, The Black Isle, Highlands, Scotland, UK, July. Did you know? Despite their small size Pine martens defend territories up to 25 km2.
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Eric Baccega / Herd of Muskox with calf (Ovibos moschatus) standing in the snow, Banks Island, North West Territories, Canada, August
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Eric Baccega / Three Muskox (Ovibos moschatus) running through snow, Banks Island, North West Territories, Canada
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Patricio Robles Gil / Silverberry River, Backbone Range, Mackenzie Mountains, Northwest Territories, Canada
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Andy Rouse / Saltwater crocodile (Crocodylus porosus) striking, Northern Territories, Australia
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Eric Baccega / Northern lights (Aurora borealis) Northwest territories, March 2008, Canada
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Eric Baccega / Northern lights (Aurora borealis) Northwest territories, March 2008, Canada
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Eric Baccega / Northern lights (Aurora borealis) Northwest territories, March 2008, Canada
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Eric Baccega / Northern lights (Aurora borealis) Northwest territories, March 2008, Canada
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Eric Baccega / Igloo lit up at night under northern lights (Aurora borealis) Northwest Territories, Canada March 2007
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Eric Baccega / Igloo with lights at night by moonlight, Northwest Territories, Canada March 2007
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Eric Baccega / Igloo under northern lights, Northwest Territories, Canada March 2007
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Staffan Widstrand / High arctic landscape in spring, -40 degrees C, Bylot Is, Baffin Is, North West Territories, Canada, 1995
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Laurent Geslin / Two male urban Red foxes, territorial posture at junction of territories {Vulpes vulpes} London, UK
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Staffan Widstrand / Man on skidoo racing across ice, Baffin Island, Canadian Arctic, Northwest Territories
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David Noton / Panoramic view of Ayer's rock (Uluru) Northern Territories, Australia
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Staffan Widstrand / Bylot island, Baffin islands, melting sea ice in spring, Canad
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Staffan Widstrand / Tracks of Polar bear in snow {Ursus maritimus} Baffin Island, Nunavut, North West Territories, Canada
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Michael Pitts / Schreiber's long fingered bat, {Miniopterus schreibersii} New Territories, Hong Kong.
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Richard Kirby / Open mouthed saltwater crocodile, Northern Territories, Australia
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Martha Holmes / Female polar bear with cub on ice floe (Ursus maritimus) North West Territories, Canada
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Martha Holmes / Polar bear swimming near ice floe. Canada, North West Territories
