- The platypus, with its duck bill and webbed feet is a unique Australian animalone of the world's most remarkable animals.www.parks.tas.gov.au/wildlife/mammals/platypus.html
- Duck-bill, platypus, Ornithorhynchus anatinus, monotreme, bibliography, etymology, What is a Platypus and other Quandaries.www.rentcomputers.com/platwhat.html
- www.healthsci.utas.edu.au/physiol/mono/Monotremata.html