Ralph Pace / Silky Shark (Carcharhinus falciformis), Galapagos Shark (Carcharhinus galapagensis), Dusky Shark (Carcharhinus obscurus), and Black-tip Shark (Carcharhinus limbatus) group working with Yellowfin Tuna...

Ralph Pace / Silky Shark (Carcharhinus falciformis), Galapagos Shark (Carcharhinus galapagensis), Dusky Shark (Carcharhinus obscurus), and Black-tip Shark (Carcharhinus limbatus) group working with Yellowfin Tuna...

Alex Mustard / World War II British motorbikes (Norton 16H) stacked up on the back of truck in the hold of wreck of HMS Thistlegorm, with soldierfish (Myripristis murdjan) swimming above. Sha'ab Ali, Sinai, Egypt. R...

Daniel Heuclin / Kramer's / Large Eyed Pit Viper (Cryptelytrops / Trimeresurus macrops). Captive. Endemic to South East Asia.

Michael Durham / Red-eyed Tree Frog (Agalychnis callidryas) in rain, native to Central and South America

Michael Durham / Red-eyed Tree Frog (Agalychnis callidryas) in rain, native to Central and South America

Michael Durham / Red-eyed Tree Frog (Agalychnis callidryas) in rain, native to Central and South America

Norbert Wu / Green Sea Turtle (Chelonia mydas) being cleaned by Yellow-eyed Surgeonfish (Ctenochaetus strigosus), Hawaii

Birgitte Wilms / Diana's Hogfish (Bodianus diana) and Soft Coral (Dendronephthya sp), Red Sea, Egypt

Norbert Wu / Bottlenose Dolphin (Tursiops truncatus) chases a school of Bigeye Scad (Selar crumenophthalmus), Roatan, Honduras

David Hall / Many-eyed snake eel (Ophichthus polyophthalmus), head peering out of burrow. Pantar, Alor Archipelago, Indonesia; November, 2006.

Gary Bell/ Oceanwide / Diana's Hogfish (Bodianus diana) and Basslet (Pseudanthias sp) school in coral reef with feather stars, Great Barrier Reef, Australia

Gary Bell/ Oceanwide / Diana's Hogfish (Bodianus diana) and Basslet (Pseudanthias sp) school in coral reef with feather stars, Great Barrier Reef, Australia

Agustin Esmoris / Blue-eyed Cormorant (Phalacrocorax atriceps) pair courting in nesting colony, Falkland Islands

Agustin Esmoris / Blue-eyed Cormorant (Phalacrocorax atriceps), Black-browed Albatross (Thalassarche melanophrys), and Rockhopper Penguin (Eudyptes chrysocome) colony, Falkland Islands

David Fleetham / Bigeye emperor (Monotaxis grandoculis) foraging over sand at night, Hawaii.

Michael Milicia/ BIA / Blue-eyed Cormorant (Phalacrocorax atriceps) landing in colony, Bleaker Island, Falkland Islands

Piotr Naskrecki / Stalk-eyed Fly (Diopsis sp) males at lek, Gorongosa National Park, Mozambique

Linda Pitkin / Bigeye emperor fish (Monotaxis grandoculis) Ras Ghozlani, Ras Mohammed National Park, Egypt, Red Sea.

Alex Mustard / Portrait of a Blackbar soldierfish (Myripristis jacobus) infected with Cymothoid isopod parasites. The large parasite between the eyes is a female, the smaller individuals are males. Seven Mile Beach,...

Paul D Stewart / Skull of an Asian elephant (without its tusks) showing how the high nasal orifice for the trunk gives the impression of a single large eye socket. There is evidence that fossil elephant skulls (prehis...

Doug Wechsler / Golden-eyed lacewing (Chrysopa oculta) eating aphid (Uroleucon helianthicola) on Jersulalem artichoke (Helianthus tuberosa) Morris Arboretum, Philadelphia, Pennsylvania, USA. July.

Sean Crane / Blue-eyed Cormorant (Phalacrocorax atriceps) pair at nest in rookery, Sea Lion Island, Falkland Islands

Sean Crane / Blue-eyed Cormorant (Phalacrocorax atriceps)landing at colony, Sea Lion Island, Falkland Islands

Sean Crane / Blue-eyed Cormorant (Phalacrocorax atriceps) stealing nesting material from neighboring nest, Sea Lion Island, Falkland Islands

Sean Crane / Blue-eyed Cormorant (Phalacrocorax atriceps) pair courting in colony, Sea Lion Island, Falkland Islands

Chris Mattison / Kinabalu Large-Eyed Litter Frog (Leptobrachium gunungense) Kinabalu National Park, Sabah, Borneo.

Pascal Kobeh / Bluestreak cleaner wrasses (Labroides dimidiatus) cleaning Bigeye emperor (Monotaxis grandoculis) Sudan. Red Sea.

Cyril Ruoso / Emerald-eyed Treefrog (Hypsiboas crepitans) eggs, Sierra Nevada de Santa Marta, Colombia

Cyril Ruoso / Red-eyed Tree Frog (Agalychnis callidryas) eggs on leaf, Barro Colorado Island, Panama

Franco Banfi / Red / Blotcheye soldierfish (Myripristis murdjan) and sea whips coral, Junceella at Fotteyo caves, Maldives, Indian Ocean

Roberto Rinaldi / Smiths green eyed gecko (Gecko smithii) in tree, Indonesia

Daniel Heuclin / Kramer's / Large Eyed Pit Viper (Cryptelytrops / Trimeresurus macrops). Captive. Endemic to South East Asia.

Brent Stephenson / Antarctic Shag (Leucocarbo / Phalacrocorax [atriceps] bransfieldensis) (also known as blue-eyed shag) pair at their nest with a large chick. Port Lockroy, Antarctic Peninsula, Antarctica, January.

LYNN M. STONE / Domestic dog, Doberman pinschers with cropped ears amongst Rudbeckia flowers, male on left, female on right, Illinois, USA

Pete Oxford / White-bellied Shag (Phalacrocorax atriceps albiventer) group with Black-browed Albatross (Thalassarche melanophrys) colony in the background, Steeple Jason Island, Falkland Islands

Martin van Lokven / Red-eyed Tree Frog (Agalychnis callidryas) eggs, Tortuguero National Park, Costa Rica

Pete Oxford / White-bellied Shag (Phalacrocorax atriceps albiventer) colony, Pebble Island, Falkland Islands

Kevin Schafer / Blue-eyed Cormorant (Phalacrocorax atriceps) nesting colony, Bleaker Island, Falkland Islands

Christian Ziegler / Red-eyed Tree Frog (Agalychins callydrias) eggs with developing embryos inside, Soberania National Park, Panama

Christian Ziegler / Red-eyed Tree Frog (Agalychnis callydrias) eggs with developing embryos beginning to drop into pond below for hatching, Soberania Natioanl Park, Panama

Christian Ziegler / Blue-sided Leaf Frog (Agalychnis annae) egg clutch, San Jose, Costa Rica

Christian Ziegler / Red-eyed Tree Frog (Agalychnis callidryas) egg clutches are stuck to the underside of leaves overhanging water when the tadpoles hatch they drop into the water below, Barro Colorado Island, Panama

Christian Ziegler / Red-eyed Tree Frog (Agalychnis callidryas) different aged eggs on the same leaf, one and four days old, Soberania National Park, Panama

Christian Ziegler / Parrot Snake (Leptophis ahaetulla) eating egg clutch of Red-eyed Tree Frog (Agalychnis callidryas) tadpoles hatching, Soberania National Park, Panama

Christian Ziegler / Parrot Snake (Leptophis ahaetulla) eating egg clutch of Red-eyed Tree Frog (Agalychnis callidryas) tadpoles hatching, Soberania National Park, Panama

Christian Ziegler / Red-eyed Tree Frog (Agalychnis callidryas) series of early induced hatching, five day old egg clutch, by manual touch, Soberania National Park, Panama

Christian Ziegler / Red-eyed Tree Frog (Agalychnis callidryas) series of early induced hatching, five day old egg clutch, by manual touch, Soberania National Park, Panama

Christian Ziegler / Red-eyed Tree Frog (Agalychnis callidryas) egg clutch, four days old, Soberania National Park, Panama

Christian Ziegler / Red-eyed Tree Frog (Agalychnis callidryas) backlit egg clutch, four days old, Soberania National Park, Panama

Piotr Naskrecki / Stalk-eyed Fly (Diopsidae) males engaged in communal courtship know as leking, rainforest, Guinea, West Africa

Piotr Naskrecki / Red-eyed Tree Frog (Agalychnis callidryas) ready to hatch eggs with fully developed tadpoles inside beginning to slide down the stem of the plant to which they were attached, Costa Rica

Jane Burton / Domestic Cat {Felis catus} Amber-eyed and blue-eyed white kittens in a large teacup with bowl of roses.

Flip de Nooyer / Black-browed Albatross (Thalassarche melanophrys) pair building nest near Rockhopper Penguins (Eudyptes chrysocome) and Blue-eyed Shags (Phalacrocorax atriceps), Falkland Islands

Michael & Patricia Fogden / African Daisy (Ursinia cakilefolia) spring flowers, Skilpad flower reserve, Namaqualand, South Africa

Michael & Patricia Fogden / African Daisy (Ursinia cakilefolia) spring flowers, Skilpad flower reserve, Namaqualand, South Africa

Heidi & Hans-Juergen Koch / Red-eyed Tree Frog (Agalychnis callidryas) eggs, native to the tropical rainforests of Central America

Heidi & Hans-Juergen Koch / Red-eyed Tree Frog (Agalychnis callidryas) eggs, native to the tropical rainforests of Central America

Michael & Patricia Fogden / Red-eyed Tree Frog (Agalychnis callidryas) eggs containing developing embryos on leaf, Costa Rica

Norbert Wu / Bottlenose Dolphin (Tursiops truncatus) chases a school of Bigeye Scad (Selar crumenophthalmus), Roatan, Honduras

Norbert Wu / Bottlenose Dolphin (Tursiops truncatus) chases a school of Bigeye Scad (Selar crumenophthalmus), Roatan, Honduras

Norbert Wu / Red-eyed Tree Frog (Agalychnis callidryas) developing eggs laid on leaf above water, Panama Rainforest

Norbert Wu / Red-eyed Tree Frog (Agalychnis callidryas) developing eggs laid on leaf above water, Panama Rainforest

GEORGETTE DOUWMA / Lined sweetlips fish swims with shoal of Large-eyed jacks. Digitally manipulated image

Agustin Esmoris / Blue-eyed Cormorant (Phalacrocorax atriceps) defending nest in colony, Falkland Islands

Agustin Esmoris / Blue-eyed Cormorant (Phalacrocorax atriceps) pair courting in nesting colony, Falkland Islands

Ralph Pace / Silky Shark (Carcharhinus falciformis), Galapagos Shark (Carcharhinus galapagensis), Dusky Shark (Carcharhinus obscurus), and Black-tip Shark (Carcharhinus limbatus) group working with Yellowfin Tuna...

Agustin Esmoris / Blue-eyed Cormorant (Phalacrocorax atriceps) flock taking flight, Puerto Madryn, Argentina

Christian Ziegler / Tropical Forest Dragon (Gonocephalus liogaster) lizard feeding on large cicada, Lambir Hills National Park, Sarawak, Malaysia

Richard Herrmann / Green Sea Turtle (Chelonia mydas) being cleaned by Yellow-eyed Surgeonfish (Ctenochaetus strigosus), Kona Coast, Hawaii

Premaphotos / March / St. Mark's fly (Bibio marci) mating pair, large-eyed (holoptic) male on the right, UK

Flip de Nooyer / Blue-eyed Cormorant (Phalacrocorax atriceps) colony on Bird Island, Faro Les Eclaireurs lighthouse in the background, Beagle Channel off of Tierra del Fuego, Argentina

Norbert Wu / Bottlenose Dolphin (Tursiops truncatus) chases a school of Bigeye Scad (Selar crumenophthalmus), Roatan, Honduras

Doug Perrine / Bigeye emperor (Monotaxis grandoculis) portrait, Honokohau, North Kona, Hawaii, Pacific Ocean.

Doug Perrine / Schooling Bigeye emperors (Monotaxis grandoculis), Honokohau, North Kona, Hawaii, Pacific Ocean.

Doug Perrine / Bigeye emperor (Monotaxis grandoculis) sub-adult, portrait, Honokohau, Kona, Hawaii, Pacific Ocean.

Roland Seitre / Little corella (Cacatua sanguinea gymnopis) flock taking flight, Australia.

Roland Seitre / Little corella (Cacatua sanguinea gymnopis) flock in flight, Australia.

Roland Seitre / Little corella (Cacatua sanguinea gymnopis) flock perched on roof, Australia.

Roland Seitre / Little corella (Cacatua sanguinea gymnopis) flock in flight, Australia.

Roland Seitre / Little corella (Cacatua sanguinea gymnopis) flock in flight, backlit by the setting sun, Australia.

Joel Sartore / Photo Ark / Arabian cat snake (Telescopus dhara) head portrait, Arabia's Wildlife Centre, UAE. Captive.

Joel Sartore / Photo Ark / Arabian cat snake (Telescopus dhara) coiled up, portrait, Arabia's Wildlife Centre, UAE. Captive.

Alex Hyde / Red-eyed leaf frog (Agalychnis callidryas) developing embryos on a leaf over a rainforest pool, Costa Rica.

Nick Upton / Shore hoverfly / Large spotty-eyed drone fly (Eristalinus aeneus) collecting pollen from Alexanders (Smyrnium olusatrum) flowers, Trevose, Head, Cornwall, UK. April.

Nick Upton / Shore hoverfly / Large spotty-eyed drone fly (Eristalinus aeneus) collecting pollen from Alexanders (Smyrnium olusatrum) flowers, Trevose, Head, Cornwall, UK. April.

Charlie Hamilton-James / Group of Parachute tree frogs (Agalychnis saltator) spawning on leqaves in tree above swamp. This event happens after heavy night rain during the start of the wet season. Osa Conservation area, south...

Charlie Hamilton-James / Group of Parachute tree frogs (Agalychnis saltator) spawning on leaves in tree above swamp. This event happens after heavy night rain during the start of the wet season. Osa Conservation area, south...

Charlie Hamilton-James / Group of Parachute tree frogs (Agalychnis saltator) spawning in tree above swamp. This event happens after heavy night rain during the start of the wet season. Osa Conservation area, south west Costa...

Charlie Hamilton-James / Group of Parachute tree frogs (Agalychnis saltator) spawning in tree above swamp. This event happens after heavy night rain during the start of the wet season. Osa Conservation area, south west Costa...

Charlie Hamilton-James / Group of Parachute tree frogs (Agalychnis saltator) spawning on leaves in tree above swamp. This event happens after heavy night rain during the start of the wet season. Osa Conservation area, south w...

Charlie Hamilton-James / Group of Parachute tree frogs (Agalychnis saltator) spawning on leaves in tree above swamp. This event happens after heavy night rain during the start of the wet season. Osa Conservation area, south...

Charlie Hamilton-James / Group of Parachute tree frogs (Agalychnis saltator) spawning on leaves in tree above swamp. This event happens after heavy night rain during the start of the wet season. Osa Conservation area, south w...

Charlie Hamilton-James / Group of Parachute tree frogs (Agalychnis saltator) spawnin on leaves in tree above swamp. This event happens after heavy night rain during the start of the wet season. Osa Conservation area, south w...

Charlie Hamilton-James / Group of Parachute tree frogs (Agalychnis saltator) spawning on leaves in tree above swamp. This event happens after heavy night rain during the start of the wet season. Osa Conservation area, south...