has a large range, with an estimated global extent of occurrence of . Its global population estimated to be 3.8–6.7 million individuals. For these reasons, the species is evaluated as least concern. The expansion and establishment of the species over large ranges, though, has led it to be classed as an invasive species (although little, if any impact has been noted yet). Relationship with humans A conspicuous species, the cattle egret has attracted many common names. These mostly relate to its habit of following cattle and other large animals, and it is known variously as cow crane, cow bird or cow heron, or even elephant bird or rhinoceros egret. Its Arabic name, abu qerdan, means "father of ticks", a name derived from the huge number of parasites such as avian ticks found in its breeding colonies. The Maasai people consider the presence of large numbers of cattle egrets as an indicator of impending drought and use it to decide on moving their cattle herds. The cattle egret is a popular bird with cattle ranchers for its perceived role as a biocontrol of cattle parasites such as ticks and flies. A study in Australia found that cattle egrets reduced the number of flies that bothered cattle by pecking them directly off the skin. It was the benefit to stock that prompted ranchers and the Hawaiian Board of Agriculture and Forestry to release the species in Hawaii. Not all interactions between humans and cattle egrets are beneficial. The cattle egret can be a safety hazard to aircraft due to its habit of feeding in large groups in the grassy verges of airports, and it has been implicated in the spread of animal infections such as heartwater, infectious bursal disease, and possibly Newcastle disease. References External links Ageing and sexing (PDF) by Javier Blasco-Zumeta & Gerd-Michael Heinze Cattle Egret - The Atlas of Southern African Birds Bubulcus Birds described in 1758 Cosmopolitan birds Taxa named by Carl Linnaeus Birds of Nepal