Cattle Egret

The Cattle Egret (Scientific name - Babulcus ibis) is a small white heron type bird, similar in appearance to the Great Egret, although much smaller. The name comes from the bird's habit of flocking in pastures and they have been known to perch on the back of a cow. These birds are found in Southern Europe (where they are believed to have originated), Africa, North and South America, Australia and New Zealand. They have been introduced in a number of other locations, including Hawaii in 1959. They are a basically white bird with an orange/yellow beak, have greyish yellow legs and display buff plumage during breeding. 
Top and bottom photos were taken in Maui, Hawaii in November 2012; Other photos taken at Lake Tohopekaliga, Kissimmee Florida in August 2016.