Mitsuaki Iwago / Hippopotamus (Hippopotamus amphibius) nursing young while Cattle Egrets (Bubulcus ibis) perch atop their backs, Sub-Saharan Africa

Jose B. Ruiz / Cattle egret on nest in tree {Bubulcus ibis} Spain

Jose B. Ruiz / Cattle egret on nest in tree {Bubulcus ibis} Spain

John Cancalosi / Cattle egrets roosting in tree in flooded land {Bubulcus ibis} California, USA

Jose B. Ruiz / Cattle egret {Bubulcus ibis} Spain

Steve Knell / Cattle egret, breeding plumage {Bubulcus ibis} Australia

Hanne & Jens Eriksen / Cattle egret portrait {Bubulcus ibis} Oman

Gabriel Rojo / Cattle egret displaying {Bubulcus ibis} Argentina

Gabriel Rojo / Snowy egret {Egretta thula} + Cattle egret {Bubulcus ibis} La Pampa, Argentina Macachin, Pampa

Tony Heald / Cattle egret portrait {Bubulcus ibis} breeding plumage Etosha NP Namibia

Jose B. Ruiz / Cattle egret perched in tree {Bubulcus ibis} Spain

Mike Wilkes / Cattle egret {Bubulcus ibis} Texas, USA.

Pete Oxford / Cattle egret, Ndumu Game Reserve, South Africa

Dietmar Nill / Cattle egret flock in flight {Bubulcus ibis} Extremadura, Spain

Steve Knell / Cattle egret {Bubulcus ibis} near grazing cattle Spain

Bernard Castelein / Cattle Egret (Bubulcus ibis) on Elephant's back, Kenya Amboseli NP

Richard Du Toit / African buffalo {Syncerus caffer} + Cattle egrets {Bubulcus ibis} Botswana, SavuteChobe NP

Richard Du Toit / White Rhinoceros (Ceratotherium simum) feeding near Cattle Egrets (Bubulcus ibis), Rietvlei Nature Reserve, Gauteng, South Africa

Richard Du Toit / Cattle Egret (Bubulcus ibis) landing on Burchell's Zebra (Equus burchellii), Rietvlei Nature Reserve, Gauteng, South Africa

Tui De Roy / Cattle Egret (Bubulcus ibis) and Cape Buffalo (Syncerus caffer), Ol Pejeta Conservancy, Kenya

Nature Production / Cattle Egret {Bubulcus ibis} foraging beside working tractor in rice field, Tosayamada, Kochi, Japan, May

Theo Allofs / Lechwe (Kobus leche) feeding and Cattle Egret (Bubulcus ibis) in Moremi Game Reserve, Okavango Delta, Botswana

Pete Oxford / Cape Buffalo (Syncerus caffer) herd resting with a few Cattle Egret (Bubulcus ibis), Africa

Pete Oxford / Cape Buffalo (Syncerus caffer) herd resting with a few Cattle Egret (Bubulcus ibis), Africa

Mike Wilkes / Cattle egret {Bubulcus ibis} portrait, perched on top of tree, Spain

Mitsuaki Iwago / Blue Wildebeest (Connochaetes taurinus) herd crossing stream with Cattle Egrets (Bubulcus ibis) overhead, Serengeti

Konrad Wothe / Cattle Egret (Bubulcus ibis) flock flying, Pantanal, Brazil

Konrad Wothe / Cattle Egret (Bubulcus ibis) group resting atop floating Hippopotamus (Hippopotamus amphibius), Ngorongoro Crater, Tanzania

Gabriel Rojo / Cattle egret {Bubulcus ibis} La Pampa, Argentina Macachin, Pampas

Steven David Miller / Cattle egret breeding plumage {Bubulcus ibis} Florida USA