 He then lived on Phuket Island in
Southern Thailand, until moving the Australia to live.Since 1977, Clifford, with Dawn W. Frith, has studied various aspects of tropical rainforest avifauna in Australia, New Guinea and elsewhere for over three decades.His studies have resulted in innumerable scientific publications (136 to date) on the behaviour, nesting biology, mating systems, and systematics of bowerbirds, birds of paradise, and other rainforest-dwelling bird species.