cattle egret

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A small egret (Bubulcus ibis) that feeds among grazing cattle. It is native to Africa and southern Eurasia but is now found worldwide.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A small egret, Bubulcus ibis, of the heron family (Ardeidae)

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun small white egret widely distributed in warm regions often found around grazing animals