Alex Mustard / Yellowtail tang (Zebrasoma xanthurum) male and female turn belly to belly during spawning to ensure fertilization. Temple, Ras Umm Sid, Sharm El Sheikh, Sinai, Egypt. Red Sea. This action is very fast...

Alex Mustard / Yellowtail tang (Zebrasoma xanthurum) male courting a female prior to spawning at dusk on a coral reef. Temple, Ras Umm Sid, Sharm El Sheikh, Sinai, Egypt. Red Sea.

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...

Donald M. Jones / Blue Grouse (Dendragapus obscurus) male displaying, western Montana

Jordi Chias / Two male Dusky groupers (Epinephelus marginatus) fighting for territory during mating season at 'baixa do meros', a small pinnacle at Formigas islets Protected area, near Santa Maria Island, Azores. F...

Chris & Monique Fallows / Dusky dolphins (Lagenorhynchus obscurus) porpoising, Puerto Madryn, Peninsula Valdez, Argentina, December.

Chris & Monique Fallows / Dusky dolphins (Lagenorhynchus obscurus) porpoising, Puerto Madryn, Peninsula Valdez, Argentina, December.

Chris & Monique Fallows / Dusky dolphins (Lagenorhynchus obscurus) porpoising, Puerto Madryn, Peninsula Valdez, Argentina, December.

Alex Mustard / Red and black anemonefish (Amphiprion melanopus) in a Bulb tentacle sea anemone (Entacmaea quadricolor). Kri Island, Raja Ampat, West Papua, Indonesia, South East Asia. Dampier Strait, Tropical West P...

Donald M. Jones / Blue Grouse (Dendragapus obscurus) male displaying, western Montana

Fiona Rogers / Dusky leaf monkey (Trachypithecus obscurus) baby on a branch . Khao Sam Roi Yot National Park, Thailand. March 2015.

Fiona Rogers / Dusky leaf monkey (Trachypithecus obscurus) juvenile portrait . Khao Sam Roi Yot National Park, Thailand. March 2015.

Anup Shah / Dusky leaf monkey (Trachypithecus obscurus) juvenile yawning . Khao Sam Roi Yot National Park, Thailand. March 2015.

Anup Shah / Dusky leaf monkeys (Trachypithecus obscurus) in tree, one holding baby . Khao Sam Roi Yot National Park, Thailand.

Anup Shah / Dusky leaf monkey (Trachypithecus obscurus) baby playing . Khao Sam Roi Yot National Park, Thailand.

David Kjaer / Duke of Burgundy butterfly (Hamearis lucina), Wiltshire, UK, June.

Ben Lascelles / Great Dusky Swift (Cypseloides senex) Birds flying past rainbow created by waterfalls, Iguazu National Park, Argentina, October 2008

Mark Carwardine / Dusky dolphin breaching {Lagenorhynchus obscurus} Kaikoura, New Zealand

Brent Stephenson / Dusky dolphin (Lagenorhynchus obscurus) somersaults from the water, Kaikoura, Canterbury, New Zealand. February.

Brent Stephenson / Dusky Dolphins (Lagenorhynchus obscurus) porpoising as they swim beside a boat. Off Kaikoura, Canterbury, New Zealand, October.

Juergen Freund / Dusky garden eels (Heteroconger enigmaticus) feeding on sandy seabed, Indonesia.

Inaki Relanzon / Thousand-year-old Canary Juniper, (Juniperus turbinata canariensis/ Juniperus phoenicea var. turbinata ) against a dusky sky. El Sabinar, El Hierro Island, Canary Islands, February 2011.

Thomas Marent / Dusky Leaf Monkey (Trachypithecus obscurus) young, Khao Sam Roi Yot National Park, Thailand

Wild Wonders of Europe / Pitkin / Dusky grouper (Epinephelus marginatus) with mouth wide open, 'Merouville' ('grouper City') Lavezzi Islands, Corsica, France, September 2008

Donald M. Jones / Blue Grouse (Dendragapus obscurus) male displaying, western Montana

Mark Bowler / Dusky titi monkey {Callicebus moloch} feeding on rainforest fruits, Yavari River, Amazon, Peru

Hiroya Minakuchi / Dusky Dolphin (Lagenorhynchus obscurus) pair, Kaikoura, New Zealand

Fred Bavendam / Dusky Batfish (Platax pinnatus) on reef, Gili Islands, Indonesia

Wild Wonders of Europe / Pitkin / Dusky grouper (Epinephelus marginatus)with a few fish lice (parasitic copepods) are visible near its nostril, Cala di Grecu, Lavezzi Islands, Corsica, France, September 2008 WWE BOOK.

Wild Wonders of Europe / Pitkin / Dusky grouper (Epinephelus marginatus) 'Merouville' ('grouper City') Lavezzi Islands, Corsica, France, September 2008

Wild Wonders of Europe / Pitkin / Dusky grouper (Epinephelus marginatus) Cala di Grecu, Lavezzi Islands, Corsica, France, September 2008

Wild Wonders of Europe / Pitkin / Dusky grouper (Epinephelus marginatus) 'Merouville' ('grouper City') Lavezzi Islands, Corsica, France, September 2008

Wild Wonders of Europe / Pitkin / Dusky grouper (Epinephelus marginatus) Cala di Grecu, Lavezzi Islands, Corsica, France, September 2008

Wild Wonders of Europe / Pitkin / Dusky grouper (Epinephelus marginatus) by seagrass, Cala di Grecu, Lavezzi Islands, Corsica, France, September 2008

Wild Wonders of Europe / Pitkin / Dusky grouper (Epinephelus marginatus) 'Merouville' ('grouper City') Lavezzi Islands, Corsica, France, September 2008

Wild Wonders of Europe / Pitkin / Dusky grouper (Epinephelus marginatus) with mouth open, 'Merouville' ('grouper City') Lavezzi Islands, Corsica, France, September 2008

Wild Wonders of Europe / Pitkin / Dusky grouper (Epinephelus marginatus) 'Merouville' ('grouper City') Lavezzi Islands, Corsica, France, September 2008

Wild Wonders of Europe / Pitkin / Dusky grouper (Epinephelus marginatus) amongst rocks, Cala di Grecu, Lavezzi Islands, Corsica, France, September 2008

Wild Wonders of Europe / Pitkin / Dusky grouper (Epinephelus marginatus) 'Merouville' ('grouper City') Lavezzi Islands, Corsica, France, September 2008

Wild Wonders of Europe / Pitkin / Dusky grouper (Epinephelus marginatus) with mouth wide open 'Merouville' ('grouper City') Lavezzi Islands, Corsica, France, September 2008

Wild Wonders of Europe / Pitkin / Dusky Grouper (Epinephelus marginatus) by seagrass, Endangered, Cala di Grecu, Lavezzi Islands, Corsica, September 2008 WWE Mission: Lavezzi Island Reserve, Corsica

Pete Oxford / Great dusky swifts {Cypseloides senex} flying to roost behind waterfall, Noel Kempff, Bolivia, South America

Gabriel Rojo / Dusky dolphins {Lagenorhynchus obscurus} Golfo Nuevo, Argentina

Gabriel Rojo / Dusky dolphins {Lagenorhynchus obscurus} Argentina

Gabriel Rojo / Dusky dolphin {Lagenorhynchus obscurus} Valdez peninsula, Argentina

Gabriel Rojo / Dusky dolphin leaping {Lagenorhynchus obscurus} Golfo Nuevo, Argentina

Todd Pusser / Dusky dolphin doing backflip {Lagenorhynchus obscurus}, Kaikoura, New Zealand, Pacific

Todd Pusser / Dusky dolphin group bow-riding {Lagenorhynchus obscurus}, Kaikoura, New Zealand, Pacific

Todd Pusser / Dusky dolphin playing with kelp {Lagenorhynchus obscurus}, Kaikoura, New Zealand

Flip Nicklin / Dusky Dolphin (Lagenorhynchus obscurus) jumping, New Zealand

Flip Nicklin / Dusky Dolphin (Lagenorhynchus obscurus) jumping, Kaikoura, New Zealand

Flip Nicklin / Dusky Dolphin (Lagenorhynchus obscurus) trio surfacing, Kaikoura, New Zealand

Flip Nicklin / Dusky Dolphin (Lagenorhynchus obscurus) portrait

Todd Pusser / Killer whale {Orcinus orca} attacking Dusky dolphin Kaikoura New Zealand

TOM WALMSLEY / Dusky dolphin underwater {Lagenorhynchus obscurus} Kaikoura, New Zealand

Pete Oxford / Great dusky swifts {Cypseloides senex} flock in flight, morning exit from Ahlfeld waterfall, Noel Kempff NP, Bolivia, South America

Todd Pusser / Dusky dolphin surfacing {Lagenorhynchus obscurus}, Kaikoura, New Zealand, Pacific

Tony Heald / Dusky dolphins just below surface {Lagenorhynchus obscurus} False Bay, South Africa

Hanne & Jens Eriksen / Spotted redshank (Tringa erythropus) in breeding plumage, in shallow water. Denmark, May.

Sergio Hanquet / Glasseye snapper (Heteropriacanthus cruentatus) Tenerife, Canary Islands.

Sergio Hanquet / Glasseye snapper (Heteropriacanthus cruentatus), headshot. Tenerife, Canary Islands.

Sergio Hanquet / Glasseye snapper (Heteropriacanthus cruentatus) portrait. Tenerife, Canary Islands.

Sergio Hanquet / Canary fish (Epinephelus marginatus) portrait with mouth open. El Hierro, Canary Islands.

Sergio Hanquet / Canary fish (Epinephelus marginatus). El Hierro, Canary Islands.

Sergio Hanquet / Canary fish (Epinephelus marginatus) in reef. El Hierro, Canary Islands.

Sergio Hanquet / Canary fish (Epinephelus marginatus) resting on sea floor. El Hierro, Canary Islands.

Sergio Hanquet / Canary fish (Epinephelus marginatus) in reef. El Hierro, Canary Islands.

Ernie Janes / Harris's hawk (Parabuteo unicinctus) in flight, captive falconry bird.

Ernie Janes / Harris's hawk (Parabuteo unicinctus) in flight, captive falconry bird.

Ernie Janes / Dusky nightjar (Antrostomus saturatus) Costa Rica.

Ernie Janes / Dusky nightjar (Antrostomus saturatus) Costa Rica.

Oscar Dewhurst / Dusky Titi monkey (Callicebus moloch) family troop sitting on a fallen tree in the Peruvian Amazon, with one grooming another. Madre de Dios, Peru. March

Oscar Dewhurst / Dusky Titi monkey (Callicebus moloch) family troop sitting on a fallen tree in the Peruvian Amazon, with one grooming another. Madre de Dios, Peru. March

Oscar Dewhurst / Dusky Titi monkey (Callicebus moloch) two on branch of dead tree in the Peruvian Amazon. Madre de Dios, Peru. March. Cropped

Oscar Dewhurst / Dusky Titi (Callicebus moloch) on tree branch in the Peruvian Amazon. Madre de Dios, Peru. March

Pascal Kobeh / Dusky / Yellowbelly grouper (Epinephelus marginatus), Canary Islands

Marie Lochman / Dusky antechinus (Antechinus swainsonii) Australian Alps, Kosciuszko NP, New South Wales, Australia.

Marie Lochman / Dusky antechinus (Antechinus swainsonii) Australian Alps, Kosciuszko NP, New South Wales, Australia.

Jiri Lochman / Dusky antechinus (Antechinus swainsonii) female with pouch young protruding out of the pouch, Kosciuszko NP, New South Wales, Australia.

Jiri Lochman / Dusky antechinus (Antechinus swainsonii) female with pouch young protruding out of the pouch, Kosciuszko NP, New South Wales, Australia.

Jiri Lochman / Dusky Antechinus (Antechinus swainsonii) Kosciuszko NP, New South Wales, Australia.

Jiri Lochman / Dusky antechinus (Antechinus swainsonii) female with pouch young protruding out of the pouch, Kosciuszko NP, New South Wales, Australia.

Jiri Lochman / Dusky antechinus (Antechinus swainsonii) Kosciuszko NP, New South Wales, Australia.

Jiri Lochman / Dusky antechinus (Antechinus swainsonii) Kosciuszko NP, New South Wales, Australia.

Robert Valentic / Earless agamid (Aphaniotis fusca) primary lowland rainforest, Tioman Island, Malaysia.

Robert Valentic / Dusky toadlet (Uperolia fusca) Coffs Harbour in northern NSW, Australia.

Roger Powell / Spotted Redshank (Tringa erythropus) watching from the top of an old post. Karigasniemi, Inari, Finnish Lapland, May.

Donald M. Jones / Blue Grouse (Dendragapus obscurus) male displaying in spring, Montana

David Tipling / Spotted redshank (Tringa erythropus) wintering along coastal creek at Thornham Norfolk, England, UK. December

Stephane Granzotto / Harris hawk (Parabuteo unicinctus) perched in tree, controlled conditions with falconry bird.

Stephane Granzotto / Harris hawk (Parabuteo unicinctus) landing on prey, controlled conditions with falconry bird.

Stephane Granzotto / Harris hawk (Parabuteo unicinctus) falconry bird feeding on falconers hand.

Jeff Vanuga / Lava gull (Larus fuliginosus) near Dragons Hill, Santa Cruz Island, Galapagos Islands, Ecuador.

Luke Massey / Great dusky swifts (Cypseloides senex) roosting behind one of the falls at Iguassu Falls, Brazil

Luke Massey / Great dusky swifts (Cypseloides senex) roosting behind one of the falls at Iguassu Falls, Brazil