duck-billed platypus (Ornithorhynchus anatinus) Australian Museum: Platypus Though monotremes' fossil record is limited http://australianmuseum.net.au/platypus Platypus duck-billed platypus (Ornithorhynchus anatinus) Australian Museum: Platypus https://australianmuseum.net.au/platypus Australian Museum: Platypus Platypus Scientist Spotlight Australian Museum: Platypus