Western Grey Kangaroos (Macropus fuliginosus) are common in southern Western Australia. This mob of kangaroos was in a field on the edge of Leschenault Inlet, about 140 kilometres (87 miles) south of Perth. The animals were feeding, loafing and grooming in the afternoon sun when one of Australia’s best-loved birds, a small black and white Flycatcher called the Willie Wagtail (Rhipidura leucophrys), landed on the back of a female kangaroo. Willie Wagtails often associate with large mammals – they pluck their fur for their nests and rely on them to flush small insects – the Willie’s favourite food. The Willie Wagtail jumped on and off the female Kangaroo’s back – finally flying off when she began scratching herself.