Bence Mate / Great egret (Ardea alba) with green colouring near beak during breeding season, Lake Csaj, Pusztaszer, Hungary, April.

Claudio Contreras / Green heron (Butorides virescens), Xochimilco wetlands, Mexico City, June

Cheryl-Samantha Owen / Green-backed heron (Butorides striatus) jumping, Aldabra Atoll, Seychelles

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

Cheryl-Samantha Owen / Striated green heron (Butorides striatus) jumping to catch dragonfly prey, Aldabra Atoll, Seychelles, Indian Ocean

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

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

Tom Vezo / Green heron {Butorides virescens} Mexico

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

Tom Vezo / Green heron {Butorides virescens} Mexico

Danny Green / Grey Heron (Ardea cinerea) at night. Lincolnshire, UK, September.

Danny Green / Grey Heron (Ardea cinerea) at night. Lincolnshire, UK, September.

Danny Green / Grey heron (Ardea cinerea) wading at night, reflected in water. Lincolnshire, UK, September.

Jeff Vanuga / Lava heron (Butorides sundevalli) on Santiago Island. Galapagos Islands.

Bruno D'Amicis / Green heron (Butorides virescens) in Chuchillas del Toa Biosphere Reserve, Cuba.

George Sanker / Great blue heron (Ardea herodias) catching Green frog (Lithobates clamitans) Acadia National Park, Maine, USA. June.

George Sanker / Great blue heron (Ardea herodias) catching Green frog (Lithobates clamitans) Acadia National Park, Maine, USA. June.

David Tipling / Striated / Green-backed heron (Butorides striata degens) Seychelles race, Alphonse Atoll, Seychelles

David Tipling / Striated / Green-backed heron (Butorides striata degens) perched in rain, Alphonse Atoll, Seychelles

John Chan / Juvenile Green heron (Butorides virenscens) catching fish from perch over a tidal inlet, Bolsa Chica Ecological Reserve, Southern California, USA, August.

John Chan / Juvenile Green heron (Butorides virenscens) catching fish from perch over a tidal inlet, Bolsa Chica Ecological Reserve, Southern California, USA, August.

John Chan / Juvenile Green heron (Butorides virenscens) catching fish from perch over a tidal inlet, Bolsa Chica Ecological Reserve, Southern California, USA, August.

John Chan / Juvenile Green heron (Butorides virenscens) catching fish from perch over a tidal inlet, Bolsa Chica Ecological Reserve, Southern California, USA, August.

Nick Upton / Cattle egret (Bubulcus ibis) flock landing on marshy pastureland beside a group of Lapwings (Vanellus vanellus), Somerset Levels, UK, October 2019. Cattle egrets have been wintering in the UK in incre...

Claudio Contreras / Green Heron (Butorides virescens), Ria Lagartos Biosphere Reserve, Yucatan Peninsula, Mexico, May

Hanne & Jens Eriksen / Striated heron (Butorides striata) with Scorpionfish (Scorpaenidae) in beak, standing on rock. Oman, November

Ann & Steve Toon / Greenbacked heron (Butorides striatus) walking through water, Zimanga private game reserve, KwaZulu-Natal, South Africa.

Ann & Steve Toon / Greenbacked heron (Butorides striatus) peering from perch, Zimanga private game reserve, KwaZulu-Natal, South Africa.

Robin Chittenden / Grey heron (Ardea cinerea) with Lapwings (Vanellus vanellus) mobbing, Norfolk, England, UK, May.

Robin Chittenden / Grey heron (Ardea cinerea) with Lapwing (Vanellus vanellus) mobbing it, Norfolk, England, UK, May.

Robin Chittenden / Grey heron (Ardea cinerea) with Lapwing (Vanellus vanellus) mobbing it, Norfolk, England, UK, May.

Lucas Bustamante / Green Heron (Butorides virescens). Yasuni National Park, Orellana, Ecuador

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

Aflo / Grey heron (Ardea cinerea) staning in water with Acer in autumn colour, Lake Kinrin, Oita, Japan. November.

George Sanker / Green heron (Butorides virescens) fishing from branch perch above water. Everglades National Park, Florida, USA. March.

David Woodfall / Grey heron (Ardea cinerea) hunting on the margin of a freshwater marsh, Oxwich Marsh, Swansea, Wales, UK, July.

Tony Heald / Green-backed heron (Butorides striata) Kruger National Park, South Africa.

Nick Hawkins / Lava / Galapagos heron (Butorides sundevalli) with Marine iguanas (Amblyrhynchus cristatus) in background. Isabela Island, Galapagos.

Nick Hawkins / Lava / Galapagos heron (Butorides sundevalli) standing amongst volcanic rocks. Isabela Island, Galapagos.

John Cancalosi / Black-crowned night-heron (Nycticorax nycticorax) juvenile preening whilst standing on log. Toxin forming Blue-green algae (Woronichinia naegeliana) in water behind. Maryland. October 2018.

John Chan / Green heron (Butorides virescens) stalking and catching a Topsmelt silverside (Atherinops affinis) on the edge of a tidal flat, Bolsa Chica Ecological Reserve, California, USA, September.

Tui De Roy / Striated heron (Butorides striata) with crab prey, Punta Espinosa, Fernandina Island, Galapagos

Tui De Roy / Striated heron (Butorides striata) hunting on coast, Punta Espinosa, Fernandina Island, Galapagos

Tui De Roy / Lava heron (Butorides sundevalli) Sullivan Bay, Santiago Island, Galapagos

Tui De Roy / Lava heron (Butorides sundevalli) Punta Suarez, Es[a¤ola Island, Galapapgos

Tui De Roy / Great blue heron (Ardea herodias) with Green turtle (Chelonia mydas) prey on beach, Las Bachas, Santa Cruz Island, Galapagos

Bernard Castelein / Striated heron (Butorides striatus) Madidi National Park, Bolivia

Roy Mangersnes / Striated heron (Butorides striata) fishing in the surf, Fernandina Island, Galapagos.