Roger Powell / Five Cattle egrets (Bubulcus ibis) in flight, Castro Verde, Alentejo, Portugal, April.

Felicity Lanchester,Felicity Lanchester / Mixed group of Cattle egrets (Bubulcus ibis), Great egrets (Ardea alba), African openbill storks (Anastomus lamelligerus) and Sacred ibis (Threskiornis aethiopicus) gathering to roost, Selous Game Res...

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

Mitsuaki Iwago / Black Rhinoceros (Diceros bicornis) grazing in grassland surrounded by a flock of Cattle Egrets (Bubulcus ibis), Ngorongoro Crater, Tanzania

Chase Dekker / African Elephant (Loxodonta africana) herd and Cattle Egrets (Bubulcus ibis), Amboseli National Park, Kenya

Chase Dekker / African Elephant (Loxodonta africana) mother and calf and Cattle Egrets (Bubulcus ibis), Amboseli National Park, Kenya

Chase Dekker / African Elephant (Loxodonta africana) pair and Cattle Egrets (Bubulcus ibis), Amboseli National Park, Kenya

Chase Dekker / African Elephant (Loxodonta africana) herd with Cattle Egrets (Bubulcus ibis), Amboseli National Park, Kenya

Chase Dekker / African Elephant (Loxodonta africana) females and calf with Cattle Egrets (Bubulcus ibis), Amboseli National Park, Kenya

Patricio Robles Gil / Indian rhinoceros (Rhinoceros unicornis) mother and calf with Cattle egrets (Bubulcus ibis) Kaziranga National Park, Assam, India.

Patricio Robles Gil / Indian rhinoceros (Rhinoceros unicornis) mother and calf with Cattle egrets (Bubulcus ibis) Kaziranga National Park, Assam, India.

Staffan Widstrand / Wild Wonders of China / Pere David's deer / Milu (Elaphurus davidianus), with Great white egrets (Ardea alba), Cattle egrets (Bubulcus ibis), Little egrets (Egretta garzetta) and Intermediate egrets (Ardea intermedia), H...