Stephen Belcher / Christmas Island Red Crab (Gecarcoidea natalis) crossing the road with sign in the background, Christmas Island, Australia

Stephen Belcher / Christmas Island Red Crab (Gecarcoidea natalis) group crossing road during annual migration, Christmas Island, Australia

Stephen Belcher / Christmas Island Red Crab (Gecarcoidea natalis) group crossing road during annual migration, Christmas Island, Australia

Juergen Freund / Pink Anemonefish {Amphiprion perideraion} peering out from closed anemone, Indo-pacific

Juan Carlos Munoz / Orangutan {Pong pygmaeus} portrait with eyes closed, Sungai Kinabatangan, Sabah, Borneo, Malaysia

Nick Garbutt / Closed bud of Rafflesia flower (Rafflesia keithii) Lower slopes of Mt Kinabalu, near Poring Hot Springs, Kinabalu NP, Sabah, Borneo, Malaysia

Nick Garbutt / Closed bud of Rafflesia flower (Rafflesia keithii) Lower slopes of Mt Kinabalu, near Poring Hot Springs, Kinabalu NP, Sabah, Borneo, Malaysia

Luiz Claudio Marigo / The drought of 2007 was so severe in the Amazon Basin that this watercourse was "closed". Amazonas River, between Itacoatiara town and the mouth of Madeira River, Amazonas State, Northern Brazil.

Jasper Doest / Gray Wolf (Canis lupus) lying flat in the snow with eyes closed, Norway

Doug Perrine / American alligator (Alligator mississippiensis) mouth closed but teeth showing, split level, Big Cypress National Preserve, Florida Everglades, USA

Andy Sands / Holly Blue butterfly (Celastrina argiolus) wings closed, feeding on Purple Loosestrife, West Sussex, England, UK

Andy Sands / Red Admiral butterfly (Vanessa atalanta) wings closed, feeding on rotting apples, Captive, UK

Andy Sands / Common Blue (Polyommatus icarus) Male on flower, wings closed on Marjoram, Captive

Andy Sands / Purple Emperor butterfly (Apatura iris) on Oak with wings closed, Captive, UK

Rolf Nussbaumer / Mexican Gold Poppy (Eschscholzia californica mexicana) flower closed, Tonto National Forest, Bartlett Lake , Arizona, USA, March

Adrian Davies / Camberwell beauty {Nymphalis antiopa} wings closed, UK

Silvia Reiche / Tulip (Tulipa sp), Hoogeloon, Netherlands

Silvia Reiche / Tulip (Tulipa sp), Hoogeloon, Netherlands

GEORGETTE DOUWMA / Pink anemonefish (Amphiprion perideraion) on closed anemone, Indonesia, Indo-Pacific.

Nick Turner / "Footpath closed" sign at Upton-on-Severn, Worcestershire, June 2007

Ingo Arndt / Monarch (Danaus plexippus) butterfly cluster, some individuals are basking while most have their wings closed, Michoacan, Mexico

Ingo Arndt / Monarch (Danaus plexippus) butterflies with closed wings in overwintering colony, Michoacan, Mexico

Ingo Arndt / Monarch (Danaus plexippus) butterflies with closed wings in overwintering colony, Michoacan, Mexico

Ingo Arndt / Monarch (Danaus plexippus) butterflies with closed wings in overwintering colony, Michoacan, Mexico

Richard Du Toit / Nile Crocodile (Crocodylus niloticus) with its eyes closed, Chobe National Park, Botswana

Hans Christoph Kappel / Lesser purple emperor butterfly {Apatura ilia clytie} wings closed, Germany

Jane Burton / Baby Mouse {Mus genus}, eyes still closed

Paul Hobson / Small Skipper butterfly (Thymelicus sylvestris) on twig, wings closed, Peak District NP, UK

Jeff Rotman / Strawberry Anemone (Tealia lofotensis) closed. California, USA, Pacific Ocean.

Andy Sands / Black Hairstreak Butterfly (Satyrium pruni) at rest with wings closed on Blackthorn. UK. Captive.

Andy Sands / Shark moth (Cucullia umbratica) at rest wings closed. UK. Captive.

Andy Sands / Black Hairstreak Butterfly (Satyrium pruni) at rest with wings closed on Blackthorn. UK. Captive.

Andy Sands / Shark moth (Cucullia umbratica) At rest wings closed. UK. Captive.

Andy Sands / Black Hairstreak Butterfly (Satyrium pruni) at rest with wings closed on Blackthorn. UK. Captive.

Andy Sands / White admiral butterfly (Limenitis camilla) At rest on Honeysuckle with wings closed. UK. Captive.

Andy Sands / Silver washed fritillary (Argynnis paphia) On bramble flower with wings closed. UK. Captive.

Andy Sands / Shark moth (Cucullia umbratica) At rest wings closed. UK. Captive.

Andy Sands / Small pearl bordered Fritillary (Boloria selene) At rest with wings closed. UK. Captive

Andy Sands / Large Copper Butterfly (Lucaena dispar) Wings closed with proboscis fully extended. UK. Captive.

Martin Gabriel / Dutch Crocus (Crocus vernus) with dew drops on closed buds, Bavaria, Germany

PREMAPHOTOS / Saturniid moth(Automeris bilinea) with front wings closed obscuring eye-spots on the hind-wings, in rainforest, Peru

PREMAPHOTOS / Convolvulus hawkmoth (Agrius / Herse convolvuli) with wings closed at rest, Switzerland.

Pete Oxford / Antandroy herdsman wearing hat made from goat skin and shoes from Zebu skin. The gourd is for storing water or milk and the top is closed off with a corn cob. Spiny forest of Southern MADAGASCAR. 200...

Jason Smalley / Sessile oak, terminal bud closed {Quercus petraea} Lancashire, UK sequence 1/2

Jane Burton / Anxious Pembrokeshire Welsh Corgi bitch (round-eyed stare, closed mouth, glancing away to seek escape route) picked up by owner

Nature Production / Goby Minnow {Pseudogobio esocinus esocinus} probing for food in sand with mouth closed, Japan

Nature Production / Feather Duster Worm {Sabellastarte japonica} with crown closed, Japan, Sequence 1/2

Hans Christoph Kappel / Camouflaged trapdoor spider trap closed Ctenizidae) Spain

Juergen Freund / Lifeguard removing Jellyfish from net, after clearing stinger-resistant enclosure, Queensland, Australia Note - Surf Lifesaving Queensland have an effective policy of dragging nets through the water...

Suzi Eszterhas / Cheetah {Acinonyx jubatus} 5-day cub, with eyes closed crawling to mother in nest, Masai Mara Reserve, Kenya

Dan Burton / Snakelocks anemone retracted and closed (Anemonia viridis) Cornwall, UK

Juergen Freund / Close up of stone coral (Favites sp), polys closed, Indo Pacific

Paul Hobson / Brown Argus (Aricia agestis) with wings closed at rest, Derbyshire, uk

Piotr Naskrecki / Caecilian (Gymnophis multiplicata) a small bump or chemosensory tentacle sits where the eye should be, serves as a scent organ since their nostrils are closed while burrowing underground, Costa Rica

Willem Kolvoort / Underwater view of Perfoliate pondweed (Potamogeton perfoliatus) in Zuiderzee estuary, Ijsselmeer, Holland. On the bottom are fossil shells from the time the estuary was salt, but it has been closed...

Andy Sands / Portrait of speckled Wood Butterfly (Pararge aegeria)with wings closed. Captive. UK

Andy Sands / Gatekeeper / Hedge brown butterfly {Pyronia tithounus} resting with wings closed, Wales, UK.

Andy Sands / Small skipper butterfly {Thymelicus flavus} resting with wings closed, Hertfordshire, UK.

Owen Newman / Serval {Felis serval} resting in grass with eyes closed, Ngorongoro Crater, Tanzania.

Andy Sands / Purple Hairstreak {Quercusia quercus} On Oak leaf wings closed, Captive, UK.

Andy Sands / Wall brown / Wall butterfly {Lasiommata mergera} resting on flower with wings closed, Captive, UK.

Jane Burton / Domestic Cat {Felis catus} tabby tortoiseshell, close-up of eyes with pupils dilated closed in bright light.

Jane Burton / Domestic Cat {Felis catus} 2-day blue Burmese kitten, face portrait with eyes still closed.

Jane Burton / Domestic Cat, 1-day ticked-silver kitten 'Bella', eyes still closed, offspring of 'Pansy'

Jane Burton / Black domestic cat {Felis catus} eyes with pupils closed in bright light

Niall Benvie / Young male European lynx (Lynx lynx) eyes closed sleeping, Bohemia, Czech Republic.

Jane Burton / Domestic Cat {Felis catus} with pupils closed in bright light.

Jane Burton / Domestic Cat, one-day kitten 'Red', eyes still closed, offspring of 'Pansy'

Jane Burton / Domestic Cat, 1-day ticked-tabby kitten 'Gus', eyes still closed, offspring of 'Pansy'

Jane Burton / Domestic Cat, 7-day ticked-tabby kitten 'Gus', eyes still closed, offspring of 'Pansy'

Philippe Clement / Open and closed cones from Maritime pine {Pinus pinaster} Belgium

Paul Hobson / Male Purple emperor butterfly {Apatura iris} wings closed, feeding on horse dung, southern England, UK.

Ross Hoddinott / Orange tip (Anthocharis cardamines) butterfly resting, wings closed. Devon, UK

Steven David Miller / Palamedes swallowtail butterfly {Papilio palamedes} wings closed, USA

Staffan Widstrand / Close-up of Ural owl {Strix uralensis} with eyes closed, Vastmanland, Sweden.

Kim Taylor / Tokay gecko {Gecko gecko} eye showing pupil closed. Captive, occurs SE Asia.

Paul Hobson / Glanville fritillary butterfly, wings closed {Melitaea cinxia} England

Heidi & Hans-Juergen Koch / Golden Hamster (Mesocricetus auratus) young, 10 days old, sitting in the subterranean food store, eyes still closed

Heidi & Hans-Juergen Koch / Golden Hamster (Mesocricetus auratus) two young, six day old young with eyes still closed, one is laying over the other

Jan Vermeer / European Chestnut (Castanea sativa) open and closed fruit with mushrooms on forest floor, southern Europe, north Africa and Asia

Mark Payne-Gill / Red admiral butterfly, wings closed {Vanessa atalanta} England, UK, Europe

Nick Upton / Indian leaf butterfly, wings closed mimicing leaf {Kallima paraletka} Taiwan

Duncan Mcewan / Small heath butterfly on Heather, Scotland (Coenoympha pamphilus)

Duncan Mcewan / Small heath butterfly resting, Scotland (Coenoympha pamphilus)

Duncan Mcewan / Dark green fritillary (Mesoacidalia aglaja) showing underside of wings. Scotland, UK, Europe

Hans Christoph Kappel / Emporer moth resting on tree, wings closed, Germany

Steven David Miller / Ulysses butterfly. Wings closed {Papilio ulysses} Australia.

Duncan Mcewan / Grayling butterfly, wings closed on dune moss (Hipparchia semele) Scotland, UK

Niall Benvie / Male common blue butterfly with wings closed. Scotland, UK

Doug Wechsler / Heliconius butterfly at night roost, Guyana, S. America

Paul Hobson / Marsh fritillary butterfly portrait {Euphydryas aurinia} wings closed, England UK

Philippe Clement / Giant eagle owl eyes closed looking backwards {Bubo lacteus} South Africa Kalahari