Staffan Widstrand / Black-capped Night heron (Nycticorax nycticorax) feeding on fish at fish farm pond, Pusztaszer protected landscape, Kiskunsagi, Hungary, May

Bence Mate / Black crowned night heron (Nycticorax nycticorax) at twilight with other herons in the background, including Grey heron (Ardea cinerea) in flight, Lake Csaj, Kiskunsagi National Park, Pusztaszer, Hun...

Juan Carlos Munoz / Black-crowned Night Heron (Nycticorax nycticorax) portrait. Everglades National Park, Florida, USA, February.

Wild Wonders of Europe / Widstrand / Night heron (Nycticorax nycticorax) on branch, Lake Kerkini, Macedonia, Greece, May 2009

Thomas Hinsche/ BIA / Black-crowned Night Heron (Nycticorax nycticorax) juvenile foraging, Hungary

Thomas Hinsche/ BIA / Black-crowned Night Heron (Nycticorax nycticorax) juvenile, Hungary

Thomas Hinsche/ BIA / Black-crowned Night Heron (Nycticorax nycticorax) with fish prey, Hungary

Georg Scharf / Black-crowned Night Heron (Nycticorax nycticorax) foraging, Hungary

Konrad Wothe / Black-crowned Night Heron (Nycticorax nycticorax) calling, Europe

George Sanker / Black-crowned night heron (Nycticorax nycticorax) wading through swamp water, National Audubon Corkscrew Swamp Sanctuary, Florida, USA.

Staffan Widstrand / Black-crowned night heron (Nycticorax nycticorax) eating fish, Pusztaszer Reserve, Hungary. May.

Bernard Castelein / Black-crowned night heron (Nycticorax nycticorax) perched on a tree stump along the river, Allahein river, The Gambia.

Bernard Castelein / Black-crowned night heron (Nycticorax nycticorax) perched on a tree stump, flapping wings, Allahein river, The Gambia.

Bernard Castelein / Black-crowned night heron (Nycticorax nycticorax) perched on a branch with wings open, Allahein river, The Gambia.

Bernard Castelein / Black-crowned night heron (Nycticorax nycticorax) perched on a tree stump along the river, Allahein river, The Gambia.

Bernard Castelein / Black-crowned night heron (Nycticorax nycticorax) perched on a stump, preening, Allahein river, The Gambia.

Roland Seitre / Yellow-crowned night heron (Nyctanassa violacea) foraging in shallow water, St Martin, Caribbean.

Bence Mate / Black stork (Ciconia nigra), Great white egret (Ardea alba), Black crowned night heron (Nycticorax nycticorax), Grey heron (Ardea cinerea), European spoonbill (Platalea leucorodia) and Greylag geese (...

Inaki Relanzon / Black-crowned night heron (Nycticorax nycticorax falklandicus) Pebble island, Falklands.

Jack Dykinga / Black-crowned night-heron (Nycticorax nycticorax) in flight, Gilbert Riparian Preserve, Gilbert, Arizona, USA.

Steven David Miller / Black-crowned night-heron (Nycticorax nycticorax) juvenile standing on a branch above a cypress swamp, Audubon Corkscrew Swamp Sanctuary, Southwest Florida, USA. February.

John Shaw / Yellow-crowned night heron (Nyctanassa violacea) in breeding plumage. St. Johns Management Area, Florida, USA. April.

Fabian Muhlberger / Wild Wonders of China / Night heron ( Nycticorax nycticorax ) flying, Taiwan.

Gabriel Rojo / Black-crowned night-heron (Nycticorax nycticorax) with fish prey, Puerto Deseado, Patagonia, Argentina.

Loic Poidevin / Black-crowned night heron (Nycticorax nycticorax) in flight, Marais de Brenne, France, June.

Pal Hermansen / Black-crowned night heron (Nycticorax nycticorax) perched on tree snag beside water. Danube delta, Romania. May.

Staffan Widstrand / Black-capped night heron (Nycticorax nycticorax) Pusztaszer protected landscape, Kiskunsagi, Hungary, May

Staffan Widstrand / Black-capped Night heron (Nycticorax nycticorax) , Pusztaszer protected landscape, Kiskunsagi, Hungary, May

Staffan Widstrand / Black-capped Night heron (Nycticorax nycticorax) at fish farm pond, Pusztaszer protected landscape, Kiskunsagi, Hungary, May

Konrad Wothe / Capped heron (Pilherodius pileatus) rainforest near Manaus, Amazon Basin, Brazil.

Bernard Castelein / Black-crowned night heron (Nycticorax nycticorax) perched in tree. Allahein River, Gambia.

Roger Powell / Black-crowned night heron (Nycticorax nycticorax) in flight with a stick in its beak & showing head plumes. Los Rodells Nature Reserve, Ebro Delta, Catalonia, Spain

Roger Powell / Black-crowned night heron (Nycticorax nycticorax) landing at the reedbed colony with a stick in its beak. Los Rodells Nature Reserve, Ebro Delta, Catalonia, Spain

Roger Powell / Black-crowned night heron (Nycticorax nycticorax) juvenile, landing in a reed bed. Los Rodells Nature Reserve, Ebro Delta, Catalonia, Spain

Sylvain Cordier / Yellow-crowned night heron (Nyctanassa violacea) perched in tree. Puerto San Carlos, Baja California Sur, Mexico.

Claudio Contreras / Yellow-crowned Night-heron (Nyctanassa violacea), Ria Celestun Biosphere Reserve, Yucatan Peninsula, Mexico, January

Claudio Contreras / Yellow-crowned Night-heron (Nyctanassa violacea) juvenile, Ria Celestun Biosphere Reserve, Yucatan Peninsula, Mexico, January

Gabriel Rojo / Black-crowned night-heron (Nycticorax nycticorax) perched in bush. Pantanal, Brazil.

Melvin Grey / Night heron (Nycticorax nycticorax) male standing in water. Kiskunsagi National Park, Hungary. May.

Melvin Grey / Night heron (Nycticorax nycticorax) male standing stalking prey in water. Kiskunsagi National Park, Hungary. May.

Rick Price / Nankeen night heron (Nycticorax caledonicus) standing on log. Ord River, The Kimberley, Western Australia.

John Shaw / Striated heron (Butorides striata) standing on giant Amazon waterlily leaf (Victoria amazonica). Porto Jofre, Pantanal, Brazil. September.

Bernard Castelein / Black-crowned Night Heron (Nycticorax nycticorax), Keoladeo NP, Bharatpur, India