Andy Rouse / Galapagos green turtle (Chelonia mydas agassisi) underwater portrait, being inquisitive, note algae growing on head and shell

Martin Willis / Budgerigar (Melopsittacus undulatus) father with begging chick at nest cavity, Queensland, Australia

Sergio Hanquet / Green sea turtle (Chelonia mydas), two viewed from above. Tenerife, Canary Islands.

Alex Mustard / Veined octopus (Amphioctopus marginatus) shelters inside an old clam shell, with silver-sides in the water above. Bitung, North Sulawesi, Indonesia. Lembeh Strait, Molucca Sea.

Alex Mustard / Veined octopus (Amphioctopus marginatus) emerging from its home in an old clam shell. Bitung, North Sulawesi, Indonesia. Lembeh Strait, Molucca Sea.

David Woodfall / Two Little terns (Sterna albifrons) at the nest amongst Black oats (Avena strigosa) growing on shell rich sands Machair, North Uist, Scotland, UK, June.

David Woodfall / Little tern (Sterna albifrons) at the nest amongst Black oats (Avena strigosa) growing on shell rich sands Machair, North Uist, Scotland, UK, June.

Stefan Christmann / Emperor penguin (Aptenodytes forsteri) egg shell on sea ice. Atka Bay, Antarctica. August.

David Fleetham / Tiny eyes of Spider conch / Scorpion shell (Lambis scorpius) peering from underside of shell, Philippines.

David Fleetham / Thorny Oyster shell (Spondylus varians), Komodo, Indonesia.

Steve Downer / Juvenile Common frog (Rana temporaria) on back of a Common snail (Cornu aspersum), UK, June.

Steve Downer / Juvenile Common frog (Rana temporaria) on back of a Common snail (Cornu aspersum), UK, June.

Cyril Ruoso / Long-tailed Macaque (Macaca fascicularis) using stone tool to break shell, Khao Sam Roi Yot National Park, Thailand

Cyril Ruoso / Long-tailed Macaque (Macaca fascicularis) using stone tool to break shell, Khao Sam Roi Yot National Park, Thailand

Ingo Arndt / Shell detail of Hermanns tortoise {Testudo hermanni} France Endangered

Sue Daly / Anemone hermit crab (Pagurus prideaux) getting into a shell, with a Cloak anemone (Adamsia palliata), Sark, British Channel Islands, UK, June.

Ingo Arndt / Ostrich (Struthio camelus) chick hatching from egg, Africa, captive.

Ingo Arndt / Ornate box turtle retracted into shell {Terrapene ornata} USA

Alex Mustard / Veined octopus (Amphioctopus marginatus) sheltering in an old clam shell, with plankton swirling around it at night (captured as trails in the long exposure). Bitung, North Sulawesi, Indonesia. Lembeh...

Ingo Arndt / Land snail (Polymita picta) collection of shells showing variation in patterning, Cuba. Endemic species.

Pedro Narra / Green turtle (Chelonia mydas) resting in the shallows of the coast, Bijagos Islands, Guinea Bissau. Endangered species.

Pedro Narra / Green Turtle (Chelonia mydas) returning to sea, Bissagos Islands, Guinea Bissau. Endangered species. 3rd Place in the SOS Especes Menacees / SOS Endangered Species Portfolio category of the Terre Sau...

Pedro Narra / Shell of Green Turtle (Chelonia mydas) outside mud house, Bissagos Islands, Guinea Bissau. Endangered species. 3rd Place in the SOS Especes Menacees / SOS Endangered Species Portfolio category of the...

Roland Seitre / Budgerigar (Melopsittacus undulatus) flock drinking and bathing in water, Wannoo, Billabong Roadhouse, Western Australia.

Roland Seitre / Budgerigar (Melopsittacus undulatus) flock in flight from grasses, ?Arubiddy, Nullarbor, Western Australia.

Roland Seitre / Budgerigar (Melopsittacus undulatus) massive flock on small trees in desert, Murchinson Shire, Western Australia. January.

Wild Wonders of Europe / Zankl / Loggerhead sea turtle (Caretta caretta) emerging from shell, Dalyan delta, Turkey, July.

Enrique Lopez-Tapia / Hamer women in traditional clothing at the Jumping of the bulls ceremony. Ethiopia, November 2014

Juergen Freund / Flock of Budgerigars (Melopsittacus undulatus ) drinking in an outback dam, Northern Territory, Australia.

Georgette Douwma / Green turtle (Chelonia mydas) with two large remoras (Echeneis naucrates) attached to its carapace, at rest on artificial reef. Mabul, Malaysia.

Juergen Freund / Chambered nautilus (Nautilus pompilius) with red whip coral. Osprey Reef, Great Barrier Reef, Queensland, Australia.

MYN / Gil Wizen / Israeli sand cockroach (Heterogamodes hebraica) composite showing ventral and dorsal view of female, Central Coastal Plain, Israel, April. Focus-stacked. meetyourneighbours.net project

Stephen Dalton / Close-up of a shell, UK.

MYN / Lily Kumpe / Composite of seashells from beach on Bali, Indonesia. Meetyourneighbtous.net project

Olga Kamenskaya / Snails (Baicalia turriformis) Lake Baikal, Russia, August.

Alex Mustard,Alex Mustard / Veined octopus (Amphioctopus marginatus) shelters in discarded coconut shell. Lembeh Strait, North Sulawesi, Indonesia. Molucca Sea.

Roland Seitre / Brown Goshawk (Accipiter fasciatus) and Budgerigar (Melopsittacus undulatus) flock, Wannoo, Western Australia, Australia

Ingo Arndt / Olive Ridley Sea Turtle (Lepidochelys olivacea) hatchlings emerging from nest and making their way to the sea at sunrise, Ostional Beach, Costa Rica

Ingo Arndt / Olive Ridley Sea Turtle (Lepidochelys olivacea) hatchlings emerging from nest and making their way to the sea at sunrise, Ostional Beach, Costa Rica

Ingo Arndt / Olive Ridley Sea Turtle (Lepidochelys olivacea) hatchlings emerging from the nest and making their way to the sea at sunrise, Ostional Beach, Costa Rica

Cheryl-Samantha Owen / Black footed penguin (Spheniscus demsersus) chick hatching inside a small incubator at the Southern African Foundation for the Conservation of Coastal Birds (SANCCOB) which collects abandoned eggs fro...

Roland Seitre / Antoine Cadi, scientist, and assistant measure the shell of an African spurred tortoise (Centrochelys / Geochelone sulcata) Sahel desert, Ferlo North Reserve, Senegal, West Africa, Vulnerable species....

Alex Mustard / Flamingo tongue (Cyphoma gibbosum) feeding on a seafan (Gorgonia ventalina) Cyphomas feed on corals and concentrate the toxic chemicals into their mantle, which they then wrap around the outside of it...

Philippe Clement / Common / Edible cockle (Cerastoderma / Cardium edule) shells on beach, Belgium

MYN / Jerry Monkman / Acadian hermit crab (Pagurus acadianus) emerging from shell, Rye, New Hampshire, USA, January. meetyourneighbours.net project

David Shale / Deepsea Hermit crab with zoanthid (Epizoanthus sp) on shell, from a coral seamount in the Indian Ocean, November 2011

Ross Hoddinott / 2020VISION / Emperor dragonfly {Anax imperator} chrysalis shell by water's edge, Denmark Farm, Wales, UK. June

Juergen Freund / Bivalve mollusc lives in crevices in colonies of living hard corals. Only the the shell opening and mantle are visible, along with the minute eyes along its margin, West New Britain, Papua New Guinea.

Juergen Freund / Newly harvested cultured Golden South Sea pearls of Oyster (Pinctada maxima) displayed in oyster shell on beach, Palawan, Philippines, May 2009

Juergen Freund / Newly harvested cultured Golden South Sea pearls of Oyster (Pinctada maxima) displayed in oyster shell, Palawan, Philippines, May 2009

Juergen Freund / Details of Thorny oyster (Spondylus varius) with "eyes" in its mantle edge near the shell, New Ireland, Papua New Guinea

Juergen Freund / Coconut / Veined octopus (Octopus marginatus) hiding in its shell home. Lembeh Strait, North Sulawesi, Indonesia.

Juergen Freund / Coconut / Veined octopus (Octopus marginatus) in a bottle cap getting a new shell to use as its home. Lembeh Strait, North Sulawesi, Indonesia.

Juergen Freund / Coconut / Veined octopus (Octopus marginatus) hiding in its bottle cap home, using a shell as a door. Lembeh Strait, North Sulawesi, Indonesia.

Juergen Freund / Coconut octopus / Veined octopus (Octopus marginatus) in its shell home. Lembeh Strait, North Sulawesi, Indonesia.

Juergen Freund / Coconut octopus / Veined octopus (Octopus marginatus) in its shell home. Lembeh Strait, North Sulawesi, Indonesia.

Juergen Freund / Coconut octopus / Veined octopus (Octopus marginatus) in its shell home. Lembeh Strait, North Sulawesi, Indonesia.

Juergen Freund / Coconut octopus / Veined octopus (Octopus marginatus) in its shell home. Lembeh Strait, North Sulawesi, Indonesia.

Juergen Freund / Coconut / Veined octopus (Octopus marginatus) hiding in its shell home. Lembeh Strait, North Sulawesi, Indonesia.

Juergen Freund / Baby orange Painted frogfish (Antennarius pictus) in a shell on the coral rubble. About 4mm in size. Lembeh Strait, North Sulawesi, Indonesia.

Juergen Freund / Coconut / Veined octopus (Octopus marginatus) ready to flee from its coconut shell home. Lembeh Strait, North Sulawesi, Indonesia.

Juergen Freund / Coconut / Veined octopus (Octopus marginatus) in its shell home. Lembeh Strait, North Sulawesi, Indonesia.

Juergen Freund / Coconut / Veined octopus (Octopus marginatus) ready to flee from its coconut shell home. Lembeh Strait, North Sulawesi, Indonesia.

Juergen Freund / Jewelmer Pearlfarm workers clean each pearl oyster regularly taking off barnacles and anything that grows on the shell, Philippines, April 2010

Juergen Freund / Jewelmer Pearlfarm, Goldlip pearl oyster (Pinctada maxima) with golden pearl on beach, Palawan, Philippines, May 2009

Juergen Freund / Hermit crab with shell covered in soft coral (Heteroxenia fuscescens) Lembeh Strait, North Sulawesi, Indonesia

Juergen Freund / Green turtle (Chelonia mydas) swimming through the sea near a coral reef, seen from above. Sipadan Island, Semporna, Sabah, Malaysia, June

Kim Taylor / Brown-lipped Banded Snail (Cepaea) against a white background. Surrey, UK, April.

Billy Black / Starfish in half Oyster (Lophia folium) shell lying on bed of seaweed. Pumpkin Island, Maine, USA.

Claudio Contreras / Pink abalone (Haliotis corrugata) shell detail, Guadalupe Island Biosphere Reserve, off the coast of Baja California, Mexico, January

Claudio Contreras / Pink abalone (Haliotis corrugata) shell detail, Guadalupe Island Biosphere Reserve, off the coast of Baja California, Mexico, January

Claudio Contreras / Pink abalone (Haliotis corrugata) shell detail, Guadalupe Island Biosphere Reserve, off the coast of Baja California, Mexico, January

Michele Westmorland / Conch (Strombidae) shell on tropical beach with stormy clouds in distance, Provodenciales, Turks and Caicos, Caribbean. June 2007

Rolf Nussbaumer / Portrait of Ornate Box Turtle (Terrapene ornata) with head retracted into shell. Sinton, Corpus Christi, Coastal Bend, Texas Coast, USA

Edwin Giesbers / Brown-lipped / Grove / Banded snails (Cepaea nemoralis) on plant stem, Menorca, Balearic Islands, Spain, Europe

Onne van der Wal / Young man snorkeling with a Green turtle (Chelonia mydas) in the Grenadines, Caribbean, February 2010. Model Released.

Onne van der Wal / Green turtle (Chelonia mydas) swimming over sea grass, Grenadines, Caribbean, February 2010.

Wild Wonders of Europe / Lundgren / Banded chink shell (Lacuna vincta) on Kelp leaf, Saltstraumen, Bod, Norway, October 2008

Sue Daly / Hawksbill turtle (Eretmochelys imbricata) with algal growth on carapace, Cebu, Philippines, March, Endangered species

Wild Wonders of Europe / Lundgren / Loggerhead turtle (Caretta caretta) swimming with the top of its shell just above the water surface, Pico, Azores, Portugal, June 2009

Wild Wonders of Europe / Zankl / Newly hatched Loggerhead turtle (Caretta caretta) showing egg tooth used to break through shell, Dalyan Delta, Turkey, August 2009

Claudio Contreras / Hawksbill turtle (Eretmochelys imbricata) Cancun National Park, Caribbean Sea, Mexico, July

Jeff Vanuga / Cowboy herding horses on winter day, Flitner ranch, Shell, Wyoming, USA, Model released, February 2008

Wild Wonders of Europe / Lundgren / Pair of Common hermit crabs (Pagurus bernhardus) male carrying female until she leaves her shell and they can mate, Trondheimsfjorden, Norway, February 2009

Wild Wonders of Europe / Lundgren / Grey top shell (Gibbula cineraria) on a kelp leaf, Moere coastline, Norway, February 2009

Wild Wonders of Europe / Lundgren / Blue rayed limpet (Patina / Ansates pellucida) on seaweed with Sea-mat / Lacy crust bryozoan (Membranipora membranacea) on shell, Saltstraumen, Bod, Norway, October 2008

Wild Wonders of Europe / Lundgren / Blue rayed limpet (Patina / Ansates pellucida) with Sea-mat / Lacy crust bryozoan (Membranipora membranacea) growing on shell, Saltstraumen, Bod, Norway, October 2008

Wild Wonders of Europe / Lundgren / Banded chink shells (Lacuna vincta) on kelp, Saltstraumen, Bod, Norway, October 2008

Wild Wonders of Europe / Lundgren / Banded chink shell (Lacuna vincta) feeding on Kelp leaf, Saltstraumen, Bod, Norway, October 2008

Wild Wonders of Europe / Lundgren / Banded chink shell (Lacuna vincta) swimming, Saltstraumen, Bod, Norway, October 2008

Carol Walker / Purebred leopard appaloosa horse running in snow, Flitner Ranch, Shell, Wyoming, USA

Carol Walker / Cowboy leading Quarter horses pack train in the snow at Flitner Ranch, Shell, Wyoming, USA. Model released.

Carol Walker / Horses running in the snow, Flitner Ranch, Shell, Wyoming, USA

Carol Walker / Palomino Draft horse running in the snow, Flitner Ranch, Shell, Wyoming, USA

Carol Walker / Cowboy on sorrel Quarter horse trotting in the snow at Flitner Ranch, Shell, Wyoming, USA Model released

Carol Walker / Cowboy on grey Quarter horse trotting in the snow at Flitner Ranch, Shell, Wyoming, USA Model released