Nigel Cattlin / Insect / invertebrate house / bug hotel with various refuge options for hiding / over-wintering, WWT, West Sussex, UK, July.

Juergen Freund / Scientist Susan Laurance leads the Daintree Drought Experiment in far north Queensland. The experiment combines the efforts of plant physiologists, ecologists, soil experts, climatologists and hydrolo...

Michael Quinton / Snowshoe Hare (Lepus americanus) browsing on a Pussy Willow (Salix discolor) twig in winter, Alaska

Michael Quinton / Snowshoe Hare (Lepus americanus) browsing on a Pussy Willow (Salix discolor) twig in winter, Alaska

Michael Quinton / Snowshoe Hare (Lepus americanus) browsing on a Pussy Willow (Salix discolor) twig in winter, Alaska

Donald M. Jones / Snowshoe Hare (Lepus americanus) in winter coat, western Montana

Jim Brandenburg / Snowshoe Hare (Lepus americanus) eating twig in winter, Minnesota

Michael Quinton / Snowshoe Hare (Lepus americanus) in snowfall, Yellowstone National Park, Wyoming

Michael Quinton / Snowshoe Hare (Lepus americanus) feeding on Pussy Willow (Salix discolor) in winter, Alaska

Michael Quinton / Snowshoe Hare (Lepus americanus) feeding on Pussy Willow (Salix discolor) branch in winter, Alaska

Karine Aigner / Barn owl (Tyto alba), six owlets of varying ages sitting in nest at bottom of abandoned hunting blind. Texas, USA. April.

Karine Aigner / Stomach contents of Burmese pythons (Python bivittatus) are separated and laid out on sheets in order to identify them. Some of the contents seen here from varying snakes are Roseate spoonbill, Pied b...

Juergen Freund / James Cook University's Susan Laurance checks data gathering equipment that measures how much moisture the trees take in. Dr. Susan Laurance leads the Daintree Drought Experiment in far north Quee...

Juergen Freund / James Cook University's Susan Laurance - Tropical Leader at the Centre for Tropical Environmental and Sustainability Studies and College of Marine and Environmental Sciences leads the Daintree Dro...

Juergen Freund / James Cook University's Susan Laurance leads the Daintree Drought Experiment in far north Queensland. The experiement combines the efforts of plant physiologists, ecologists, soil experts, climato...

Douglas Herr/ BIA / Snowshoe Hare (Lepus americanus) in summer, Alaska

Ashley Cooper / Box of free range eggs of varying colour from chickens of different breeds.

Michael Quinton / Snowshoe Hare (Lepus americanus) browsing on a Pussy Willow (Salix discolor) twig in winter, Alaska

Michael Quinton / Snowshoe Hare (Lepus americanus) browsing in winter, Alaska

Michael Quinton / Snowshoe Hare (Lepus americanus) in winter, Alaska

Michael Quinton / Snowshoe Hare (Lepus americanus) in winter, Alaska

Michael Quinton / Snowshoe Hare (Lepus americanus) browsing in winter, Alaska

Loic Poidevin / Snowshoe hare (Lepus americanus) in summer coat, Alaska, USA, August.

Michael Quinton / Canada Lynx (Lynx canadensis) feeding on Snowshoe Hare (Lepus americanus), Alaska

Donald M. Jones / Snowshoe Hare (Lepus americanus) in winter coat, western Montana

Donald M. Jones / Snowshoe Hare (Lepus americanus) in winter coat, western Montana

Michael Quinton / Snowshoe Hare (Lepus americanus), Alaska

Michael Quinton / Snowshoe Hare (Lepus americanus) coat turning white for winter, Alaska

Michael Quinton / Snowshoe Hare (Lepus americanus) browsing, coat turning white for winter, Alaska

Michael Quinton / Snowshoe Hare (Lepus americanus) in winter coat, Alaska

Michael Quinton / Snowshoe Hare (Lepus americanus) coat turning white for winter, Alaska

Michael Quinton / Snowshoe Hare (Lepus americanus) browsing, coat turning white for winter, Alaska

Sumio Harada / Snowshoe Hare (Lepus americanus) camouflaged in snow, Glacier National Park, Montana

Anup Shah / African lion (Panthera leo) cubs of varying ages playing on a fallen tree, Masai Mara National Reserve, Kenya, September

Donald M. Jones / Snowshoe Hare (Lepus americanus) hiding beneath conifer stand, northwest Montana

Donald M. Jones / Snowshoe Hare (Lepus americanus) feeding on fallen Douglas Fir (Pseudotsuga menziesii) tree, northwest Montana

Donald M. Jones / Snowshoe Hare (Lepus americanus) feeding on fallen Douglas Fir (Pseudotsuga menziesii) tree, northwest Montana

Paul Harcourt Davies / Bittersweet / Woody nightshade (Solanum dulcamara) with fruits of varying colours. Italy, Europe

Sumio Harada / Snowshoe Hare (Lepus americanus), Glacier National Park, Montana

Sumio Harada / Snowshoe Hare (Lepus americanus) in snow, Glacier National Park, Montana

Donald M. Jones / Snowshoe Hare (Lepus americanus) feeding on fir in winter, North America

Yva Momatiuk & John Eastcott / Snowshoe Hare (Lepus americanus), Denali National Park, Alaska

Yva Momatiuk & John Eastcott / Snowshoe Hare (Lepus americanus), Denali National Park, Alaska

Donald M. Jones / Snowshoe Hare (Lepus americanus) in fall coat, central Alaska

Donald M. Jones / Snowshoe Hare (Lepus americanus) juvenile, central Alaska

Donald M. Jones / Snowshoe Hare (Lepus americanus) juvenile, central Alaska

Donald M. Jones / Snowshoe Hare (Lepus americanus) in fall coat- turning to white for the winter, central Alaska

Yva Momatiuk & John Eastcott / Snowshoe Hare (Lepus americanus), Denali National Park, Alaska

Yva Momatiuk & John Eastcott / Snowshoe Hare (Lepus americanus) with summer coat beside gnawed park sign, Denali National Park, Alaska

Michael Quinton / Snowshoe Hare (Lepus americanus) portrait, Alaska

Michael Quinton / Snowshoe Hare (Lepus americanus), Alaska

Jane Burton / Angelfish {Pterophyllum sp} adult and young, captive, from rivers of Amazon basin, South america, note varying intensity of stripes

Duncan Mcewan / Ant larvae (Formica sp.) of varying sizes in rotten wood.

Petra Wegner / Domestic dog, two Eurasiers with varying blue tinges on their tongues.

Petra Wegner / Domestic dog, two Eurasiers with varying blueness of their tongues

Petra Wegner / Domestic dogs, three Eurasiers of different colours and varying degrees of blueness of their tongues.

Tim Fitzharris / Snowshoe Hare (Lepus americanus) in its summer coat amid Fireweed (Chamerion angustifolium) flowers, Alaska

Sumio Harada / Snowshoe Hare (Lepus americanus) in brown summer phase sitting in underbrush, Glacier National Park, Rocky Mountains, Montana

Thomas Mangelsen / Snowshoe Hare (Lepus americanus) in winter, Canada

Yva Momatiuk & John Eastcott / Red Fox (Vulpes vulpes) carrying Snowshoe Hare (Lepus americanus) to den, summer, Denali National Park and Preserve, Alaska

Yva Momatiuk & John Eastcott / Red Fox (Vulpes vulpes) carrying Snowshoe Hare (Lepus americanus) to den, summer, Denali National Park and Preserve, Alaska

Michael Quinton / Bobcat (Lynx rufus) hunting a Snowshoe Hare (Lepus americanus) in the winter, North America

Michael Quinton / Snowshoe Hare (Lepus americanus) gnawing tender bark off of sapling in the winter, Alaska

Jim Brandenburg / Snowshoe Hare (Lepus americanus) tracks in snow, Minnesota

Jim Brandenburg / Snowshoe Hare (Lepus americanus) camouflaged in snow, Minnesota

Michael Quinton / Snowshoe Hare (Lepus americanus) baby hiding in log, Alaska

Michael Quinton / Snowshoe Hare (Lepus americanus) with coat changing to winter camouflage in fall, Idaho

Michael Quinton / Snowshoe Hare (Lepus americanus) camouflaged in winter snow, Alaska

Jim Brandenburg / Snowshoe Hare (Lepus americanus) young in tall grass, Minnesota

Michael Quinton / Snowshoe Hare (Lepus americanus) pair browsing on a Pussy Willow (Salix discolor) twig in winter, Alaska

Michael Quinton / Snowshoe Hare (Lepus americanus) in shadows, Alaska

Michael Quinton / Alder (Alnus fruticosa) trees girdled by Snowshoe Hare (Lepus americanus), Alaska

Roland Seitre / Rainbow lorikeets (Trichoglossus moluccanus) perched side by side, showing varying colour morphs, including normal, Blue fronted, Cinnamopn and Olive. Australia. Captive.

Tui De Roy / View of Bartolome Island, near Santiago Island, showing numerous volcanic spatter and tuff cones of varying ages. Galapagos Islands, Ecuador.

Georgette Douwma / Seafish (Asteroidea) composite image showing varying number of arms on black background. South East Asia, Indo-West Pacific Ocean.

Joel Sartore / Photo Ark / Two Gray sand stars, showing varying color morphs. (Luidia lawrencei) the larger, solid colored starfish on the left and (Luidia clatherata) the smaller starfish with lines, on white background, Gulf...

Joel Sartore / Photo Ark / Two Gray sand stars, showing varying color morphs. (Luidia lawrencei) the larger, solid colored starfish on the left and (Luidia clatherata) the smaller starfish with lines, on black background, Gulf...

Paul Harcourt Davies / Two Elderflower orchids (Dactylorhiza sambucina) in varying colours, in flower, Sibillini, Umbria, Italy. May.

Nigel Cattlin / Glasshouse grown cherry tomatoes (Solanum lycopersicum), variety 'Sweet Million', varying ripeness fruit on a truss, Berkshire, UK, August.

Nigel Cattlin / Loose smut (Ustilago nuda) varying degrees of fungal disease infection on smutted ears of barley

Nick Upton / Insect hotel created by drilling holes of varying size in a large piece of wood, part of a fallen, sawn up Cedar tree, Wiltshire garden, UK, April.