 He has much experience in personal presentations at both popular and scientific levels and has also been a specialist ornithological guest lecturer to specialist tours to the highlands of New Guinea.He also carries out ecological and avifaunal surveys for various environmental agencies in tropical north Queensland, Australia.For five years (2003-2007), Clifford was Honorary Book Review Editor of "Emu - Austral Ornithology" - the international peer-reviewed scientific journal of the Royal Australasian Ornithologists Union, published by the Commonwealth Scientific and Industrial Research Organisation (CSIRO), Canberra, Australia.