George Sanker / Green heron (Butorides virescens) hunting for fish, camouflaged against tree roots, Everglades National Park, Florida, USA, March

Rolf Nussbaumer / Green heron {Butoides virescens} chick portrait, Welder Wildlife Refuge, Sinton, Texas, USA.

Tom Vezo / Green heron with eggs on nest {Butorides virescens} Mexico

Tom Vezo / Green heron {Butorides virescens} Mexico

Tom Vezo / Green heron with frog prey {Butorides virescens} Mexico

Tom Vezo / Green heron {Butorides virescens} Mexico

George Sanker / Green Heron (Butorides virescens) in wetlands. Everglades National Park, Florida, USA, March.

George Sanker / Green heron (Butorides virescens) hunting for fish, feet gripping onto branch in balancing act, Everglades National Park, Florida, USA, March

George Sanker / Green heron (Butorides virescens) just after successful fish hunt, Everglades National Park, Florida, USA, March

George Sanker / Green heron (Butorides virescens) hunting for fish, Everglades National Park, Florida, USA, March

George Sanker / Green heron (Butorides virescens) watching for fish, Everglades National Park, Florida, USA, March

Barry Mansell / Green Heron (Butorides virescens) crouching on branch waiting for prey, Everglades National Park, South Florida, USA, May

Barry Mansell / Green Heron (Butorides virescens) crouching on branch waiting for prey, Everglades National Park, South Florida, USA, May

George Sanker / Green heron (Butoroides virescens) perched, Hillsborough river SP, Florida, USA

Donald M. Jones / Green Heron (Butorides virescens) hunting from a mat of floating vegatation, Florida

Donald M. Jones / Green Heron (Butorides virescens) catching minnow, Everglades National Park, Florida. Sequence 2 of 2

Donald M. Jones / Green Heron (Butorides virescens) fishing for minnows, Everglades National Park, Florida

Donald M. Jones / Green Heron (Butorides virescens) striking at minnow, Everglades National Park, Florida. Sequence 1 of 2

Marie Read / Green Heron (Butorides virescens) in flight over water, carrying nest material, Orlando, Florida, USA

Thomas Marent / Green Heron (Butorides virescens), Tortuguero National Park, Costa Rica

Jouan & Rius / Green heron (Butorides virescens) in the waterways of Tortuguero NP, Costa Rica

Barry Bland / Green Heron {Butorides virescens} perching in tree, Florida, USA

Rolf Nussbaumer / Green Heron (Butorides virescens) with neck outstretched surrounded by Yellow Water Lily pads, Welder Wildlife Refuge, Sinton, Texas, USA. June 2005

Rolf Nussbaumer / Green Heron (Butorides virescens) in water, Starr County, Rio Grande Valley, Texas, USA. May 2002

Rolf Nussbaumer / Green Heron (Butorides virescens) with crest raised, Lake Corpus Christi, Texas, USA. May 2003

Philippe Clement / Green heron (Butorides virescens) in swamp, Carara NP, Costa Rica

Philippe Clement / Green heron (Butorides virescens) in swamp, Carara NP, Costa Rica

Shattil & Rozinski / Green heron {Butorides virescens} Texas, USA

Tom Vezo / Green Heron {Butorides virescens} preening on branch, Long Island, NY, USA.

Tom Vezo / Green Heron {Butorides virescens} perching on branch with feathers ruffled, Long Island, NY, USA.

Tom Vezo / Green heron {Butorides virescens} amongst vegetation beside water, Florida, USA

Rolf Nussbaumer / Green heron {Butoides virescens} with young begging for food at nest in Willow Tree, Welder Wildlife Refuge, Sinton, Texas, USA.

Rolf Nussbaumer / Green heron {Butoides virescens} chick in nest, Welder Wildlife Refuge, Sinton, Texas, USA.

Rolf Nussbaumer / Green heron {Butoides virescens} with chicks at nest in Willow Tree, Welder Wildlife Refuge, Sinton, Texas, USA.

Rolf Nussbaumer / Green heron {Butoides virescens} on Yellow Water Lily pads, Welder Wildlife Refuge, Sinton, Texas, USA

Tom Vezo / Green heron {Butorides virescens} Mexico

Tom Vezo / Green heron fishing {Butorides virescens} Mexico

Rolf Nussbaumer / Green heron catching frog {Butorides virescens} Texas, USA

Tom Vezo / Green Heron (Butorides virescens) with frog it has caught, Rio Grande Valley, Texas

Tom Vezo / Green Heron (Butorides virescens) on nest with eggs, Rio Grande Valley, Texas

Tom Vezo / Green Heron (Butorides virescens) perched over water, Rio Grande Valley, Texas

Tom Vezo / Green Heron (Butorides virescens) perching on reeds, Everglades National Park, Florida

Gerry Ellis / Aerial view of Heron Island, Great Barrier Reef Marine Park, Queensland, Australia

Jim Brandenburg / Green Heron (Butorides virescens) hunting, Florida

Tom Vezo / Green heron, Everglades NP, Florida, USA

Tom Vezo / Green heron (Butorides virescens). Everglades NP, Florida, USA

Tom Vezo / Green Heron (Butorides virescens) perching on mangrove roots, Florida

Tom Vezo / Green heron {Butorides virescens} foraging amongst mangrove roots, Everglades NP, Florida, USA

Norbert Wu / Reef-walking, Great Barrier Reef, Heron Island, Australia

Juergen Freund / Bean shaped polyps of an Anchor coral (Euphyllia ancora), a large polyp stony (LPS) coral. Misool, Raja Ampat, West Papua, Indonesia.

Chris Newbert / Right-handed Hermit Crab (Paguritta sp) colony in Hump Coral (Porites sp), Solomon Islands

Chris Newbert / Hermit Crab (Paguritta gracilipes) in Hump Coral (Porites sp) 30 feet deep, Solomon Islands

Chris Newbert / Stony Coral (Acropora sp) and baitfish, Solomon Islands

Chris Newbert / Mushroom Coral (Fungia fungites) detail, Palau

Norbert Wu / Orange Tube Coral (Tubastraea aurea) polyps extended only at night, Dutch Antilles, Caribbean

Fred Bavendam / Stony Coral (Acropora sp) colony releasing egg-sperm bundles during the mass coral spawning each March at Ningaloo Reef, Western Australia

Fred Bavendam / Staghorn Coral (Acropora cervicornis) colony releasing egg-sperm bundles during the mass coral spawning each March at Ningaloo Reef, Western Australia

Fred Bavendam / Several species of Basslets (Pseudanthias sp) swarming above a Leaf Coral (Pavona clavus), Milne Bay, Papua New Guinea

Fred Bavendam / Fusilier (Caesio sp) school streaming over a vast field of Disc Coral (Turbinaria reniformis), Manado, Sulawesi, Indonesia

Fred Bavendam / Stony Coral (Acropora sp) colony releasing egg-sperm bundles during the annual mass coral spawning on the Great Barrier Reef, Queensland, Australia

Fred Bavendam / Several species of Basslets (Pseudanthias sp) swarming above a Columnar Leaf Coral (Pavona clavus), Milne Bay, Papua New Guinea

Fred Bavendam / Staghorn Coral (Acropora cervicornis) colony with an extensive bleached area at its center, Kimbe Bay, Papua New Guinea

Alex Mustard / Lamarck's sheet coral (Agaricia lamarcki) close up, East End, Grand Cayman, Cayman Islands, British West Indies, Caribbean Sea.

Jeff Rotman / Stony Coral (Scleractinia) with polyps retracted. Papua New Guinea, Bismarck Sea.

Jeff Rotman / Stony Coral (Scleractinia) polyps open and feeding. Grand Turk Island, Turks and Caicos, Caribbean Sea.

Jeff Rotman / Stony Finger Coral (Acropora humilis). Papua New Guinea, Bismarck Sea.

Christian Ziegler / Hump Coral (Porites sp) growing directly under Red Mangrove (Rhizophora mangle), Bastimentos Marine National Park, Bocas del Toro, Panama

Christian Ziegler / Hump Coral (Porites sp), Bastimentos Marine National Park, Bocas del Toro, Panama

Christian Ziegler / Elkhorn Coral (Acropora palmata), Bastimentos Marine National Park, Bocas del Toro, Panama

Christian Ziegler / Great Star Coral (Montastraea cavernosa) growing directly beneath Red Mangroves (Rhizophora mangle), Bastimentos Marine National Park, Bocas del Toro, Panama

Christian Ziegler / Great Star Coral (Montastraea cavernosa) growing directly beneath Red Mangroves (Rhizophora mangle), Bastimentos Marine National Park, Bocas del Toro, Panama

Christian Ziegler / Brain Coral (Diploria labyrinthiformis), Bastimentos Marine National Park, Bocas del Toro, Panama

Christian Ziegler / Hump Coral (Porites sp), Bastimentos Marine National Park, Bocas del Toro, Panama

Pete Oxford / Christmas Tree Worm (Spirobranchus giganteus) filter feeding while attached to Brain Coral (Diploria labyrinthiformis), Bonaire, Netherlands Antilles, Caribbean

Pete Oxford / Christmas Tree Worm (Spirobranchus giganteus) filter feeding while attached to Brain Coral (Diploria labyrinthiformis), Bonaire, Netherlands Antilles, Caribbean

Pete Oxford / Christmas Tree Worm (Spirobranchus giganteus) filter feeding while attached to Great Star Coral (Montastraea cavernosa), Bonaire, Netherlands Antilles, Caribbean

Pete Oxford / Christmas Tree Worm (Spirobranchus giganteus) filter feeding while attached to Great Star Coral (Montastraea cavernosa), Bonaire, Netherlands Antilles, Caribbean

Pete Oxford / Clubbed Finger Coral (Porites porites), Bonaire, Netherlands Antilles, Caribbean

Pete Oxford / Brain Coral (Diploria labyrinthiformis), Bonaire, Netherlands Antilles, Caribbean

Pete Oxford / Lettuce Coral (Agaricia sp.). Sian Ka'an Biosphere Reserve, Mahahual Peninsula, Quintana Roo, South Yucatan Peninsula, Mexico.

Birgitte Wilms / Stony Coral (Acropora sp) polyps, Solomon Islands

Birgitte Wilms / Stony Coral (Acropora sp), Indonesia

Birgitte Wilms / Stony Coral (Acropora sp), Indonesia

Pete Oxford / Brain Coral (Diploria labyrinthiformis) on reef, Jardines de la Reina National Park, Cuba

Pete Oxford / Symmetrical Brain Coral (Diploria strigosa) on reef, Jardines de la Reina National Park, Cuba

Georgette Douwma / Stony Coral (Favia sp.), Faviidae. Rinca, Komodo National Park, Indonesia, October.

Georgette Douwma / Stony Coral (Favia rotundata), Faviidae. Rinca, Komodo National Park, Indonesia, October.

Georgette Douwma / Stony Coral (Favia rotundata), Faviidae. Rinca, Komodo National Park, Indonesia, October.

Georgette Douwma / Stony Coral (Favia rotundata), Faviidae. Rinca, Komodo National Park, Indonesia, October.

GEORGETTE DOUWMA / Stony Coral (Acropora palifera). Indonesia, October.

Georgette Douwma / Stony Coral (Diploastrea heliopora), Faviidae. Rinca, Komodo National Park, Indonesia, October.

Georgette Douwma / Stony Coral (Favia rotundata), Faviidae. Rinca, Komodo National Park, Indonesia, October.

GEORGETTE DOUWMA / Stony Coral (Acropora palifera). Indonesia, October.

Pete Oxford / Brain Coral (Diploria labyrinthiformis), Belize Barrier Reef, Belize

Pete Oxford / Brain Coral (Diploria labyrinthiformis), Belize Barrier Reef, Belize

Pete Oxford / Boulder Brain Coral (Colpophyllia natans), Belize Barrier Reef, Belize

Aflo / ic-08803 Hard coral on seabed, Saipan, Japan.

Aflo / ic-08305 Hard coral with fish. Split level. Indonesia.

Claudio Contreras / Whitestar sheet coral detail (Agaricia lamarcki) Banco Chinchorro Biosphere Reserve, Caribbean Sea, Mexico, May

Claudio Contreras / Dimpled sheet coral detail (Agaricia grahamae) Banco Chinchorro Biosphere Reserve, Caribbean Sea, Mexico, May

Claudio Contreras / Whitestar sheet coral (Agaricia lamarcki) close-up, Banco Chinchorro Biosphere Reserve, Caribbean Sea, Mexico, May

Fred Bavendam / Mushroom Coral (Fungia repanda) with its tentacles extended at night to capture food, Lizard Island, Great Barrier Reef, Australia

Fred Bavendam / Staghorn Coral (Acropora robusta) and several species of small Damselfish (Chromis sp), Great Barrier Reef, Australia

Chris Newbert / Stony Coral (Acropora sp) formation, Indonesia

Chris Newbert / Sea Fan (Melithaea sp) group on Disc Coral (Turbinaria reniformis), Indonesia

Chris Newbert / Soft Coral (Dendronephthya sp) and Soft Coral (Tubastraea sp) reef scenic with schooling fish, Indonesia

Chris Newbert / Coral reef with stony and soft corals and island rising through surface in background, Indonesia

Chris Newbert / Bowl Coral (Turbinaria peltata), Indonesia

Chris Newbert / Mushroom Coral (Heliofungia actiniformis), Indonesia

Chris Newbert / Pore Coral (Montipora undata), Indonesia

Chris Newbert / Bubble Coral (Cynarina sp) detail, Indonesia

Chris Newbert / Bubble Coral (Plerogyra simplex), Indonesia

Chris Newbert / Mushroom Coral (Fungia scutaria) detail, Indonesia

Chris Newbert / Mushroom Coral (Heliofungia actiniformis), Indonesia

Chris Newbert / Mushroom Coral (Fungia scutaria) detail, Indonesia

Chris Newbert / Octopus Coral (Galaxea fascicularis) polyps extended to feed, Indonesia

Norbert Wu / Mushroom Coral (Fungiidae) don't show flourescence as much when illuminated by the light of a camera flash, 40 feet deep, Komodo Island, Indonesia. Sequence 2 of 2

Norbert Wu / Mushroom Coral (Fungiidae) show fluorescence (and not) under normal daylight filtered by seaswater, 40 feet deep, Komodo Island, Indonesia. Sequence 1 of 2

Chris Newbert / Octopus Coral (Galaxea fascicularis) polyps, Papua New Guinea

Hiroya Minakuchi / Stony Coral (Acropora sp) branches, Borneo, Malaysia

Jeff Rotman / Lettuce Plate Coral (Scleractinia sp.). Papua New Guinea.

Juergen Freund / Coral polyps of stony coral feeding at night (Scleractinia) Carribean Sea

Hiroya Minakuchi / Staghorn Coral (Acropora cervicornis) in coral reef around Sipadan Island, Celebes Sea, Borneo

Juergen Freund / Split-level reef landscape with stony coral, Cuba, Caribbean Sea

Flip Nicklin / Orange Cup Coral (Tubastraea coccinea) with feeding tentacles extended at night, Cocos Island, Costa Rica

Fred Bavendam / Hump Coral (Porites sp) one healthy, left, and the other badly bleached, Lembeh Strait, Indonesia

Fred Bavendam / Stony Coral (Lobophyllia sp) colony showing bleaching in all but one of its large polyps, Lembeh Strait, Indonesia

Fred Bavendam / Disc Coral (Turbinaria reniformis) most exhibiting partial or total bleaching, Kimbe Bay, Papua New Guinea

Chris Newbert / Stony Coral (Lobophyllia sp) colony, Solomon Islands

Chris Newbert / Orange Cup Coral (Tubastraea coccinea), Kona, Hawaii

Birgitte Wilms / Hard Coral (Euphyllia paraencora) polyps, 60 feet deep, Solomon Islands

Chris Newbert / Coral (Alveopora sp) polyps, Red Sea, Egypt

Chris Newbert / Mushroom Coral (Fungia fungites) detail, Truk Lagoon, Micronesia

Chris Newbert / Rounded Bubblegum Coral (Plerogyra sinuosa), Coral Sea

Chris Newbert / Right-handed Hermit Crab (Paguritta sp) living in burrow in Stony Coral (Acropora sp) 30 feet deep Solomon Islands

Chris Newbert / Right-handed Hermit Crab (Paguritta sp) living in burrow in Stony Coral (Acropora sp) 30 feet deep, Solomon Islands

Chris Newbert / Stony Coral (Acropora sp) and baitfish, Solomon Islands

Chris Newbert / Tan Lettuce-leaf Coral (Agaricia agaricites), Roatan, Honduras

Norbert Wu / Boulder Brain Coral (Colpophyllia natans) common in south Florida, Bahamas and Caribbean, Saba, Dutch Antilles

Norbert Wu / Staghorn Coral spawning, coral colonies release eggs and sperm one night a year after the late spring's full moon, Great Barrier Reef

Norbert Wu / Staghorn Coral spawning occurs on consecutive evenings starting five days after the late spring's full moon, Great Barrier Reef

Chris Newbert / Cabbage Coral (Turbinaria sp) underwater, Papua New Guinea

Chris Newbert / Mandarinfish (Synchiropus splendidus) mating in Stony Coral (Acropora sp) 10 feet deep, Solomon Islands

Chris Newbert / Porcelain Coral (Leptoseris explanata), Coral Sea

Chris Newbert / Coral (Pachyseris rugosa) close-up, Great Barrier Reef, Australia