20th-century Australian naturalists

Stephen Robert Irwin was an Australian conservationist, environmentalist, zookeeper, television personality, and wildlife educator. Nicknamed the "Crocodile Hunter", he is regarded as an influential figure in Australian popular culture, and as one of the greatest conservationists of all time.

Western Australian writer, historian, botanist and artist (1908-2009)

Australian natural history illustrator, and plant collector for Ferdinand von Mueller (1830–1907)

Australian malacologist, stamp dealer and philatelist of American origin (1887–1959)

Australian naturalist (1918-1972)

Naturalist and journalist (1900-1958)