Antarctic Food Chains and Explorers' Aircraft. 1973. 1 cent Plankton. 5 cent Mawson's D.H. Gipsy Moth, 1930. 7 cent Adelie Penguin. 8 cent Rymill's D. H. Fox Moth, 1934-37. 9 cent Leopard Seal. 10 cent Killer Whale. 20 cent Albatross. 25 cent Wilkin's Lockheed Vega, 1928. 30 cent Ellsworth's Northrop Gamma, 1935. 5 cent Christensen's Avro Avian, 1934. 50 cent Byrd's Ford Tri-Motor, 1929. $1 Sperm Whale.