Mary McDonald / Flock of Cattle Egrets (Bubulcus ibis) in roosting trees at dusk, Imba Ndutu, Serengeti NP, Tanzania, East Africa.

Wild Wonders of Europe / Allofs / White Camargue horse stallion with a Cattle egret (Bulbulcus ibis) on his back, Camargue, France, April 2009

Rolf Nussbaumer / White faced ibis {Plegadis chihi} Welder Wildlife Refuge, Sinton, Texas, USA.

Thomas Mangelsen / White Ibis (Eudocimus albus) trio feeding at sunset, Ding Darling National Wildlife Refuge, Sanibel Island, Florida

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

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

Richard Du Toit / White Rhinoceros (Ceratotherium simum) with Cattle Egret perched on back, Rietvlei Nature Reserve, Gauteng, South Africa

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

Ann & Steve Toon / Cape buffalo (Syncerus caffer caffer) with Cattle egret (Bubulcus ibis ibis) on back with Eastern white pelicans on edge of lake behind, Lake Nakuru National Park, Kenya

Tim Fitzharris / White Rhinoceros (Ceratotherium simum) grazing with Cattle Egret (Bubulcus ibis), Kenya

Christophe Courteau / Yellow billed stork {Mycteria ibis} & Great white Egret {Egretta alba}, Okavango, Botswana.

Juan Carlos Munoz / White Ibis (Eudocimus albus) landing in mangrove canopy, silhouetted against dusky sky. Everglades National Park, Florida, USA, February.

Juan Carlos Munoz / White Ibis (Eudocimus albus) in flight. Everglades National Park, Florida, USA, February.

Juan Carlos Munoz / White Ibis (Eudocimus albus) in mangrove trees. Everglades National Park, Florida, USA, February.

Juan Carlos Munoz / White Ibis (Eudocimus albus) portriat, Everglades National Park, Florida, USA, February.

Rolf Nussbaumer / White-faced ibis (Plegadis chihi) adult preening, Dinero, Lake Corpus Christi, South Texas, USA.

Rolf Nussbaumer / Cattle egret (Bubulcus ibis) adult perched on cow, Dinero, Lake Corpus Christi, South Texas, USA.

Roland Seitre / Breeding project of the Hermit / Northern bald ibis (Geroniticus eremita) at the Jerez de la Frontera Zoo, Cadiz, Spain. Two eggs in tray. Critically endangered species. June 2007

Richard Du Toit / White Rhinoceros (Ceratotherium simum) and Cattle Egret (Bubulcus ibis) drinking, Rietvlei Nature Reserve, Gauteng, South Africa

Scott Leslie / White Ibis (Eudocimus albus) group taking flight, Everglades National Park, Florida

Gerrit Vyn / White ibis (Eudocimus albus) group roosting in the Mississippi River Delta wetlands, Terrebonne Parish, Louisiana, USA

John Cancalosi / Cattle Egret (Bubulcus ibis) adult (left) feeding fledgling at roost. Costa Rican tropical rainforest.

Loic Poidevin / Sacred Ibis (Threskiornis aethiopicus) head in profile.The Vendeen Marsh, French Atlantic Coast, September.

Steve Gettle / White Ibis (Eudocimus albus), Fort Myers Beach, Florida

Steve Gettle / White Ibis (Eudocimus albus) foraging, Fort Myers Beach, Florida

Steve Gettle / White Ibis (Eudocimus albus) flying, Fort Myers Beach, Florida

LYNN M. STONE / Portrait of White ibis (Eudocimus albus) St. Petersburg, Florida, USA, June

LYNN M. STONE / White ibis (Eudocimus albus) in post breeding plumage, eating mole crab and strand of sea grass, St. Petersburg, Florida, USA, June

LYNN M. STONE / White ibis (Eudocimus albus) hunting at edge of surf for mole crabs on Gulf of Mexico beach, St. Petersburg, Florida, USA, June

LYNN M. STONE / White ibis (Eudocimus albus) in post breeding plumage, with mole crab and strand of sea grass, St. Petersburg, Florida, USA, June

LYNN M. STONE / White ibises (Eudocimus albus) hunting at edge of surf on Gulf of Mexico beach, St. Petersburg, Florida, USA, June

Ernie Janes / White ibis (Eudocimus albus) in flight, Florida, USA, March

B&S Draker / White-faced Ibis (Plegadis chihi) adult foraging in water. Sinton, Corpus Christi, Coastal Bend, Texas, USA, June.

Loic Poidevin / Cattle egret (Bubulcus ibis) perched on post in marsh, preening, Vendee, France, September

Loic Poidevin / Cattle egret (Bubulcus ibis) perched on post in marsh, Vendee, France, September

Markus Varesvuo / Portrait of a Cattle Egret (Bubulcus ibis). Sultanate of Oman, March.

Pete Oxford / White Ibis (Eudocimus albus) juvenile wading, Little St. Simon's Island, Georgia

Pete Oxford / Scarlet Ibis (Eudocimus ruber) and a single White Ibis (Eudocimus albus) roosting in treetops. Guarico Province, Venezuela.

Pete Oxford / Mixed flock of whistling ducks and ibis taking flight. White-faced Whistling Duck (Dendrocygna viduata), Black-bellied Whistling-duck (Dendrocygna autumnalis), Scarlet Ibis (Eudocimus ruber). Hato Ma...

Pete Oxford / Scarlet Ibis (Eudocimus ruber) and White Ibis (Eudocimus albus) in flight. Guarico Province, Venezuela.

Marie Read / White Ibis (Eudocimus albus) catching a small crab. Estero Lagoon, Florida, USA, January.

Marie Read / White Ibis (Eudocimus albus) adult scratching, Estero Lagoon, Ft. Myers, Florida, USA, January.

Marie Read / Two White Ibis (Eudocimus albus) during a midair fight over a feeding spot in a Florida wetland, USA, March.

Marie Read / Two White Ibis (Eudocimus albus) during a midair fight over a feeding spot in a Florida wetland, USA, March.

Marie Read / Two White Ibis (Eudocimus albus) during a midair fight over a feeding spot in a Florida wetland, USA, March.

LYNN M. STONE / White Ibis (Eudocimus albus) adult in non-breeding plumage with a very small crab. Tarpon Springs, Florida, USA, November.

LYNN M. STONE / White Ibis (Eudocimus albus) adult in non-breeding plumage hunting in marine grass during extreme low tide. Tarpon Springs, Florida, USA, November.

Pete Oxford / Scarlet Ibis (Eudocimus ruber) and White Ibis (Eudocimus albus) flock flying, Hato Masaguaral working farm and biological station, Venezuela

Donald M. Jones / White Ibis (Eudocimus albus) flying back to evening roost, Florida

Donald M. Jones / White Ibis (Eudocimus albus) flying, Florida

Donald M. Jones / White Ibis (Eudocimus albus) flying back to evening roost, Florida

Donald M. Jones / White Ibis (Eudocimus albus) flying back to evening roost, Florida

Donald M. Jones / Cattle Egret (Bubulcus ibis) flying, Sarasota, Florida

LYNN M. STONE / White Ibis (Eudocimus albus) adult in breeding plumage, feeding on a small crab. Tampa Bay, Florida, USA

LYNN M. STONE / White Ibis (Eudocimus albus) foraging in shallow water, and feeding on a small crab. Tampa Bay, Florida, USA

Gerrit Vyn / White Ibis (Eudocimus albus) lightly oiled adult foraging. Contaminated as a result of the BP Deepwater Horizon oil leak, in the Gulf of Mexico, Plaquemines Parish, Louisiana, USA, July 2010.

Rolf Nussbaumer / Head portrait of White-faced Ibis (Plegadis chihi) in marsh, Fennessey Ranch, Refugio, Coastal Bend, Texas Coast, USA

Tim Laman / White ibis (Eudocimus albus) standing in water, Sanibel Island, Florida, USA.

Adrian Davies / White ibis (Eudocimus albus) standing at waters edge, Ding Darling Nature Reserve, Sanibel Island, Florida, USA

LYNN M. STONE / White Ibis (Eudocimus albus) feeding on crab, Tampa Bay, Florida, USA

LYNN M. STONE / White ibis (Eudocimus albus) wading, Tampa Bay, Florida, USA

Marie Read / White Ibis (Eudocimus albus), adult in flight, Viera, Florida, USA

David Tipling / Cattle Egret {Bubulus ibis} flock roosting on branches of tree over water, Peten, Guatemala

David Tipling / Cattle Egret {Bubulus ibis} flock roosting on branches of tree over water, Peten, Guatemala

David Tipling / White rhinoceros {Ceratotherium simum} rolling and Cattle Egret (Bubulcus ibis) Lake Nakuru, Kenya

Rod Williams / Australian / Indonesian White Ibis (Threskiornis molucca) catching a pebble in its beak, to swallow and hold in its crop, Burleigh Heads, SE Queensland, Australia, March

Jeff Vanuga / White ibis (Eudocimus albus) flock in flight, Alafia Banks Preserve, Florida, USA, March.

Jeff Vanuga / White ibis (Eudocimus albus) large flock in flight, Alafia Banks Preserve, Florida, USA, March.

Jeff Vanuga / White ibis (Eudocimus albus) flock on ground, Alafia Banks Preserve, Florida, USA, March.

Tim Laman / White Ibis (Endocimus albus) foraging in the shallows of a mangrove island among mangrove seedlings, Alafia Bank Bird Sanctuary, Sunken Island, Tampa Bay, Florida, USA.

Tim Laman / White ibis {Eudocimus albus} and Roseate spoonbills (Ajaia ajaja) feeding in the lagoon of a mangrove island, Alafia Bank Bird Sanctuary, Sunken Island, Tampa Bay, Florida, USA.

Shattil & Rozinski / White faced ibis (Plegadis chihi) in long grass, Bear River Migratory Bird Refuge, Utah, USA

Adrian Davies / White ibis (Eudocimus albus) standing in shallow water, Florida, USA

Scott Leslie / White Ibis (Eudocimus albus) juvenile flying, Everglades National Park, Florida

Scott Leslie / White Ibis (Eudocimus albus) flying, Everglades National Park, Florida

Donald M. Jones / White-faced Ibis (Plegadis chihi) wading through marsh, central Montana

Jouan & Rius / Australian white ibis / Indonesian white ibis(Threskiornis molucca) feeding, Kangaroo Island, South Australia, Australia

Jouan & Rius / Australian white ibis (Threskiornis molucca) Victoria, Australia

Bruno D'Amicis / White storks (Ciconia ciconia), Cattle egrets (Bubulcus ibis) and domestic sheep and goats feeding on rubbish on open dump site, Northern Morocco, NW Africa

Hanne & Jens Eriksen / White /Eurasian spoonbill {Platalea leucorodia} pair with one in display, and Glossy ibis {Plegadis falcinellus} Tamil Nadu, India

Winfried Wisniewski / White Ibis (Eudocimus albus) group perching on branches of dead tree, Florida

Winfried Wisniewski / White Ibis (Eudocimus albus) balancing on branch, Florida

Winfried Wisniewski / White Ibis (Eudocimus albus) balancing on branch, Florida

Winfried Wisniewski / White Ibis (Eudocimus albus) perched on branch, Florida

Winfried Wisniewski / White Ibis (Eudocimus albus) walking along the shore, Florida

Winfried Wisniewski / White Ibis (Eudocimus albus) pair walking along the shore, Florida

Winfried Wisniewski / White Ibis (Eudocimus albus) walking on mud flats, Florida

Jouan & Rius / Australian / Indonesian white ibis (Threskiornis molucca), Queensland, Australia

Rob Tilley / White Ibis (Eudocimus albus) standing in tree, Everglades NP, Florida, USA

TJ Rich / Sacred ibis {Threskiornis aethiopicus} wading in water, South Luangwa NP, Zambia

Theo Allofs / Wood Stork (Mycteria americana) and Great Egret (Ardea alba) flock taking flight, Pantanal, Brazil

Tim Fitzharris / White Ibis (Eudocimus albus) flock in a tree, North America

Tim Fitzharris / White Ibis (Eudocimus albus) juvenile in a tree, North America

Tim Fitzharris / White Ibis (Eudocimus albus) preening, North America

Tom Vezo / White Ibis (Eudocimus albus) landing, Rio Grande Valley, Texas

Tom Vezo / White Ibis (Eudocimus albus) flying, Rio Grande Valley, Texas