The Koolie is as diverse as the country it originates from, Australia. In the north of Queensland and New South Wales they are tall, medium boned and agile, bred for mustering Simmental cattle and Brahma over many miles. In The Hunter Valley region and Snowy Mountains of New South Wales, they're thicker set and shorter to flush low lying cattle from the dense bush and gullies. In Victoria, one finds the smallest variety of the Koolie. Koolies are bred to meet the needs of the stockman, grazier and farmer, all agile, all with the same ability to adapt to any situation, all with a strong willingness drive. The Koolie vary from 40 to 60 centimetres (16 to 24 in) in size and are a contrast of coat, colour and body type, although they are merled coat pattern. The solid red or black Koolie are often mistaken for Kelpies, and some bi coloured Koolie have been taken for Border Collies by the general public, rarely if ever by breeders. As all of these breeds share Collie ancestry, they resemble each other.