Alex Hyde / Cave cricket male (Troglophilus cavicola) on the side of a stalactite in a limestone cave. Plitvice Lakes National Park, Croatia. November.

Paul Souders/ Worldfoto / Black Heron (Egretta ardesiaca) canopy hunting, Chobe River, Chobe National Park, Botswana

Wim van den Heever / Black heron (Egretta ardesiaca) fishing and using wings to create an area of shade to attract fish, on the banks of the Chobe River, Botswana.

Christophe Courteau / Black heron (Egretta ardesiaca) spreads its wings on the Okavango Detla, Botswana. The birds' wings form an umbrella over the water so they can see and hunt fish more easily

Bernard Castelein / Black Egret (Egretta ardesiaca), Ankarafantsika NP, Madagascar

Bernard Castelein / Black egret (Egretta ardesiaca), Ankarafantsika NP, Madagascar

Bernard Castelein / Black Egret (Egretta ardesiaca), Ankarafantsika NP, Madagascar

Sandesh Kadur / Black heron (Egretta ardesiaca) perched in thorny tree, Lake Manyara, Lake Manyara National Park, Tanzania.

Bernard Castelein / Black egret (Egretta ardesiaca), Gambia.

Bernard Castelein / Black egret (Egretta ardesiaca) forming wings into umbrella whilst fishing, Gambia.

Bernard Castelein / Black egret (Egretta ardesiaca) forming wings into umbrella whilst fishing, Gambia.

Bernard Castelein / Black egret (Egretta ardesiaca) forming wings into umbrella whilst fishing, Gambia.

Bernard Castelein / Black egret (Egretta ardesiaca) forming wings into umbrella whilst fishing, Gambia.

Enrique Lopez-Tapia / African spoonbill (Platalea alba) landing among other Spoonbills, Spur winged lapwing (Vanellus spinosus), Black heron (Egretta ardesiaca) and Egret, Orango National Park, Bijagos UNESCO Biosphere Re...

Enrique Lopez-Tapia / African Spoonbill (Platalea alba) Great egret (Ardea alba), gyptian geese (Alopochen aegyptiacus),Black herons (Egretta ardesiaca) and Sacred ibis (Threskiornis aethiopicus), Orango National Park, B...

Ann & Steve Toon / Black heron (Egretta ardesiaca), Zimanga private game reserve, KwaZulu-Natal, South Africa, September

Bernard Castelein / Black egret (Egretta ardesiaca) landing in reed bed, Ankarafantsika National Park, Madagascar

Bernard Castelein / Black egret (Egretta ardesiaca) coming into land, Ankarafantsika National Park, Madagascar

Bernard Castelein / Black egret (Egretta ardesiaca) perching in reed bed, Ankarafantsika National Park, Madagascar

Bernard Castelein / Black egret (Egretta ardesiaca) perching in reed bed, Ankarafantsika National Park, Madagascar

Bernard Castelein / Black egret (Egretta ardesiaca) perching in reed bed, Ankarafantsika National Park, Madagascar

Lou Coetzer / Black heron (Egretta ardesiaca) using wing canopy to create shadow for hunting, Chobe River, Botswana, March.

Lou Coetzer / Black heron (Egretta ardesiaca) using wing canopy to produce shade for hunting, Chobe River, Botswana, April.

Lou Coetzer / Black heron (Egretta ardesiaca) landing, Chobe River, Botswana, July.

Lou Coetzer / Black heron (Egretta ardesiaca) in flight, Chobe River, Botswana, July.

Lou Coetzer / Black heron (Egretta ardesiaca) using wing canopy to create shade for hunting fish, Chobe River, Botswana, April.

David Williams / Black Heron (Egretta ardesiaca), Gambia

Christophe Courteau / Group of black herons (Egretta ardesiaca) on the Okavango Detla, Botswana. The birds' wings form an umbrella over the water so that they can see and hunt fish more easily

Christophe Courteau / Two black herons (Egretta ardesiaca) on the Okavango Detla, Botswana. The birds' wings form an umbrella over the water so that they can see and hunt fish more easily.

Tony Heald / Black heron / egret (Hydranassa / Egretta ardesiaca) Chobe National Park, Botswana

Tony Heald / Black heron / egret (Hydranassa / Egretta ardesiaca) umbrella feeding, using wings to shade water below, Chobe National Park, Botswana

Tony Heald / Black heron / egret (Hydranassa / Egretta ardesiaca) umbrella feeding, using wings to shade water below, Chobe National Park, Botswana

Richard Du Toit / Black Heron (Egretta ardesiaca) fishing by using wings to make an umbrella which casts a shadow over the water, Marievale, South Africa

Mike Wilkes / Black heron fishing (Egretta ardesiaca), these birds use their wings to create shade so they can see fish below in water, Abuku NR, Gambia

Hermann Brehm / Three Black herons {Egretta ardesiaca} Botswana

Hermann Brehm / Three Black herons shading water with wings to fish {Egretta ardesiaca} Botswana

Mike Wilkes / Black heron fishing, Abuku NR, The Gambia, West Africa. Fish are attracted to shaded areas because they are less conspicuous to most predators.

Hermann Brehm / Black heron fishing under shade of its wings {Egretta ardesiaca} Botswana. Fish are attracted to shaded areas because they are less conspicuous to most predators.

David Pike / Black heron fishing {Hydranassa ardesiaca} Lake Manyara Tanzani

David Pike / Black heron fishing {Hydranassa ardesiaca} Lake Manyara Tanzani

Richard Du Toit / Black heron canopy fishing {Hydranassa ardesiaca} Chobe NP Botswana

Bernard Castelein / RF - Black egret (Egretta ardesiaca) standing in shallow water with small fish in beak, Allahein River, The Gambia. (This image may be licensed either as rights managed or royalty free.)

Roland Seitre / Black heron (Egretta ardesiaca) fishing in shallow water,near Abuko Nature Reserve, Banjul, Gambia.

Roland Seitre / Black heron (Egretta ardesiaca) fishing in shallow water, near Abuko Nature Reserve, Banjul, Gambia.

Roland Seitre / Black heron (Egretta ardesiaca) fishing in shallow water with wings spread, near Abuko Nature Reserve, Banjul, Gambia.

Roland Seitre / Black heron (Egretta ardesiaca) fishing in shallow water with wings spread, near Abuko Nature Reserve, Banjul, Gambia.

Roland Seitre / Black Heron (Egretta ardesiaca) hunting by creating shade with its wings, Abuko Nature Reserve, Gambia