Mark Taylor / German Shepherd Dog bitch pup, Coco, 14 weeks old, with raised paw.

Steven Kazlowski / Portrait of Polar bear (Ursus maritimus) cub along the Bernard Spit during autumn freeze up, 1002 area of the Arctic National Wildlife Refuge, North Slope of the Brooks Range, Alaska, October 2011

David Tipling / 2020VISION / European hare (Lepus europaeus) standing up in field of Ox-eye daisies (Leucanthemum vulgare), Norfolk, England, UK, June

Chris Gomersall / 2020VISION / Herb rich conservation margin around farmland with Ox-eye daisies (Leucanthemum vulgare) at RSPB's Hope Farm, Cambridgeshire, UK, May 2011

Chris Gomersall / 2020VISION / Ox-eye daisies (Leucanthemum vulgare) in herb rich conservation margin around farmland at RSPB's Hope Farm, Cambridgeshire, UK, May

Ross Hoddinott / Oxeye daisies (Leucanthemum vulgare) low angle shot, Tamar Lakes, Cornwall, UK, June 2011.

Alex Hyde / Bullseye / Io moth (Automeris io) showing eye spot markings on wings during deimatic display to deter predators, photographed on a white background, originating from North and Central America, sequenc...

Solvin Zankl / Wild Common fruit fly (Drosophila melanogaster) Vienna Drosophila RNAi Center, Institute for Molecular Pathology, Austria [focus stacking]

Petra Wegner / British Longhair Cat, fawn-white / Highlander / Lowlander / Britannica hiding in a box.

Konrad Wothe / Common green tree frog (Litoria caerulea) in rainforest, Iron Range National Park, Cape York Peninsula, North Queensland, Australia, October

Kathryn Jeffs / Camera lens view of the 'Golden Fleece' in the centre of a horseshoe shaped iceberg off the Antarctic Peninsula, Antarctica, February 2009, Taken on location for BBC Frozen Planet series

Ernie Janes / Ox-eye daises (Leucanthemum vulgare) flowering in meadow, UK

Peter Cairns / 2020VISION / Rock ptarmigan (Lagopus mutus) male hidden by rocks, eye visible, winter plumage, Cairngorm Mountains, Cairngorms NP, Highland, Scotland, UK, February

Andrew Parkinson / 2020VISION / Oxeye daisy / Marguerite flowers (Leucanthemum vulgare) in open meadow. Hope Farm RSPB reserve, Cambridgeshire, UK, May

Ernie Janes / Ox-eye daises / marguerite (Leucanthemum vulgare) flowering on headland margin of Barley field, farmland, UK

Jane Burton / Sable Border Collie puppy, 9 weeks, sitting.

Jane Burton / Chocolate registered Border Collie dog, 9 months.

Jane Burton / White-faced black-and-white Border Collie puppy.

Mark Taylor / Border Collie puppy.

Kristel Richard / Close-up of the eye of a tobiano Kathiawari stallion, Gujarat, India.

Jane Burton / Two smooth coated Jack Russell Terrier puppies, tan and white, 6 weeks,

Jane Burton / Rough coated Jack Russell Terrier puppy, black and tan, portrait

Jane Burton / Smooth coated Jack Russell Terrier, black, tan and white, female with two 8 week puppies

Mark Taylor / Rough coated Jack Russell Terrier, tan and white, lying down, panting

Jane Burton / Smooth coated Jack Russell Terrier, white, looking up, standing on back legs

Mark Taylor / Portrait of a young Little Owl (Athene noctua).

Edwin Giesbers / Whooper Swan (Cygnus cygnus) with its beak in its feathers, eye open. The Netherlands, January.

Edwin Giesbers / Whooper Swan (Cygnus cygnus) with its beak tucked under its wing. The Netherlands, June.

Edwin Giesbers / Whooper Swan (Cygnus cygnus) with its beak tucked under its wing. The Netherlands, June.

Edwin Giesbers / Whooper Swan (Cygnus cygnus) with its beak in its feathers. The Netherlands, January.

Alex Hyde / Spiny flower mantis (Pseudocreobotra wahlbergii) in threat display with wings extended showing eye spots on wing cases. Captive, originating from Africa.

Andrew Walmsley / Silver eye / Grey backed white eye (Zosterops lateralis) in flowering Pohutukawa tree (Metrosideros excelsa) Botanic Gardens, Christchurch, South Island, New Zealand, December

Alex Hyde / Head and forelegs of tropical Katydid {Tettigoniidae} photographed on white background. Masoala Peninsula National Park, north east Madagascar.

Juan Manuel Borrero / White bald-headed uakari (Cacajao calvus) head portrait. Amazon basin. Iquitos. Loreto. Peru, Captive

Mark Carwardine / Northern white rhinoceros (Ceratotherium simum cottoni) close-up of eye, Dvur Kralove Zoo, Czech Republic, December 2009, Extinct in the wild, only eight left in captivity, critically endangered, Part...

Mark Carwardine / Northern white rhinoceros (Ceratotherium simum cottoni) close up of eye, in enclosure at Dvur Kralove Zoo, Czech Republic, the day before departure, December 2009, Extinct in the wild, only eight left...

Pete Oxford / Close up of Snow Goose (Chen caerulescens) with head tucked into wing, Slimbridge Wildfowl and Wetlands Trust, SW England, UK captive

Stephen Dalton / Barn owl (Tyto alba) close up of eye, UK, controlled conditions

Doc White / Close up of Grey whale (Eschrichitius robustus) eye, Baja California, Mexico, Pacific

Gerrit Vyn / Adult White-tailed Ptarmigan (Lagopus leucurus) camouflaged in winter plumage. Mount Rainier, Washington, USA

Mark Bowler,Mark Bowler / Red eyed tree frog (Agalychnis callidryas) walking, digital composite Captive

Wild Wonders of Europe / Wothe / Marguerites (Leucanthemum vulgare) in flower, Eastern Slovakia, Europe, June 2009

Hanne & Jens Eriksen / Oriental white eye {Zosterops palpebrosa} head on, Tamil Nadu, India

ZSSD / Southern White-faced Owl (Ptilopsis granti) portrait, native to southern Africa

Rolf Nussbaumer / Pair of Japanese white-eyes {Zosterops japonica} Hawaii, USA

Mitsuaki Iwago / Domestic Cat (Felis catus) white adult cat with one blue eye and one green eye, a condition called heterochromia which does not affect vision

Mitsuaki Iwago / Domestic Cat (Felis catus) white adult cat with one blue eye and one green eye, a condition called heterochromia which does not affect vision

Fred Bavendam / Whitemargin Stargazer (Uranoscopus sulphureus) lying buried in sand where it waits to ambush prey, Lembeh Strait, Indonesia

Richard Du Toit / White Rhinoceros (Ceratotherium simum) eye, Rietvlei Nature Reserve, Gauteng, South Africa

Richard Du Toit / White Rhinoceros (Ceratotherium simum), Rietvlei Nature Reserve, Gauteng, South Africa

Piotr Naskrecki / Praying Mantis (Tenodera sp), Woburn, Massachusetts

Piotr Naskrecki / D'orbigny's Round-eared Bat (Lophostoma silvicolum), Suriname

Piotr Naskrecki / D'orbigny's Round-eared Bat (Lophostoma silvicolum), Suriname

Piotr Naskrecki / Goldenscale Anole (Anolis chrysolepis), Suriname

Piotr Naskrecki / Katydid (Tettigoniidae) in defensive posture, Suriname

Piotr Naskrecki / Grasshopper (Acrididae), Estabrook Woods, Concord, Massachusetts

David Pattyn / Dalmatian Pelicans (Pelecanus crispus) portrait. Lake Kerkini, Greece, March 2012.

Fergus Gill / 2020VISION / Close up of a Whooper swan (Cygnus cygnus) on Hogganfield Loch, Glasgow, Scotland, UK, February.

Juan Manuel Borrero / Illustration of Pheasant's eye (Adonis vernalis). Pencil and watercolor painting.

Mark Hamblin / 2020VISION / Oxeye daisies (Leucanthemum vulgare) flowering on cliffs above Marloes Sands, Pembrokeshire Coast National Park, Wales, UK, May 2012.

Alex Hyde / Elephant Hawkmoth (Deilephila elpenor) caterpillar showing eye spots mimicing a snake, photographed on a white background. Peak District National Park, UK. September.

Markus Varesvuo / Ural Owl (Stix uralensis) perched in snowy tree, Kuusamo Finland February

Mark MacEwen / Male Marsh pride lion, Romeo and Marsh pride lioness (White eye) resting at night, Masai Mara, Kenya, taken with infra-red camera, September

Mark Taylor / Black and white Border Collie puppy and black and white rabbit.

Mark Taylor / Tabby kitten, Stanley, 5 weeks, eye to eye with Netherland Dwarf cross rabbit, Peter.

Mark Taylor / Playful tabby kitten, Stanley, 6 weeks.

Mark Taylor / Blue and white Border Collie puppy running forward.

Chris Mattison / Giant day gecko (Phelsuma grandis), cleaning eye with tongue, captive, occurs Madagascar.

Chris Mattison / Giant day gecko (Phelsuma grandis), cleaning eye with tongue, captive, occurs Madagascar

Kerstin Hinze / Cape White Eye (Zosterops pallidus) bird, foraging on Natal Bottle Brush (Greyia sutherlandii), Hidden Valley, KwaZulu-Natal, South Africa

Kerstin Hinze / Cape White Eye ( Zosterops pallidus), foraging on Natal Bottle Brush ( Greyia sutherlandii), Hidden Valley, KwaZulu-Natal, South Africa

Gary K. Smith / Oxe eye daises (Leucanthemum vulgare) growing in a country churchyard, Norfolk, UK, June

LYNN M. STONE / Eastern Brown Pelican (Pelecanus occidentalis) in breeding plumage (yellow head, red around eye, white neck) standing at edge of surf. Pinellas County, Florida, USA, November.

Martin Willis / Silvereye (Zosterops lateralis), Wilsons Promontory National Park, Victoria, Australia

Steven Kazlowski / Two young Polar bears (Ursus maritimus) during the autumn freeze up, Barter Island, off the 1002 area of the Arctic National Wildlife Refuge, North Slope of the Brooks Range, Alaska, October 2011

Carol Walker / White horse of the Camargue, eye detail, Camargue, Southern France

Guy Edwardes / 2020VISION / Fisheye view of coniferous forest at Bolderwood. New Forest National Park, Hampshire, England, UK, November, looking like section through tree trunk

David Tipling / 2020VISION / European hare (Lepus europaeus) in field of Ox-eye daisies (Leucanthemum vulgare), Norfolk, England, UK, June

Chris Gomersall / 2020VISION / Herb rich conservation margin around farmland with Ox-eye daisies (Leucanthemum vulgare) and Field poppies (Papaver rhoeas) at RSPB's Hope Farm, Cambridgeshire, UK. May 2011.

Sebastian Kennerknecht / White-breasted White-eye (Zosterops abyssinicus) pair, Hawf Protected Area, Yemen

Roland Seitre / European Chameleon (Chamaeleo chamaeleon) demonstrating independent eye movement. Captive, indigenous to southern Europe. Sequence 5 of 5.

Roland Seitre / European Chameleon (Chamaeleo chamaeleon) demonstrating independent eye movement. Captive, indigenous to southern Europe. Sequence 4 of 5.

Roland Seitre / European Chameleon (Chamaeleo chamaeleon) demonstrating independent eye movement. Captive, indigenous to southern Europe. Sequence 3 of 5.

Roland Seitre / European Chameleon (Chamaeleo chamaeleon) demonstrating independent eye movement. Captive, indigenous to southern Europe. Sequence 1 of 5.

Dave Watts / Grey backed white-eye / Silvereye (Zosterops lateralis) Tasmania, Australia

Dave Watts / Grey backed white-eye / Silvereye (Zosterops lateralis) Tasmania, Australia

Carol Walker / Close up of eye of male cremello Wild horse / mustang colt, Cremesso, that had been rounded up from the McCullough Peak herd, Wyoming, and put up for adoption, Colorado, USA, December 2011

Carol Walker / Close up of eye of male cremello Wild horse / mustang colt, Cremesso, that had been rounded up from the McCullough Peak herd, Wyoming, and put up for adoption, Colorado, USA, August 2011

Carol Walker / Close up of eye of palomino Wild horse / mustang colt Mica adopted from the Adobe Town herd, Colorado, USA, August 2011

Nick Turner / Mixed wildflowers including Corncokle, Cornflower and Ox-eye daisy growing in the Slad Valley, Stroud, Gloucestershire, UK, June 2011.

Alex Hyde / Bullseye / Io moth (Automeris io) at rest with eye spot markings on wings hidden, photographed on a white background, originating from North and Central America, sequence 2 of 2. Captive.