What are the only two types of mammal that can lay eggs?
Platamapus Duck-Mole Platipous Duck-billed Platypus Duck-Fox Palatipuses Ornithorhyncus Anatinus Duck-mole Duck billed platypus Marsupial duckbill Monotremes oviparous, ovum meroblastic Duckmole Duck billed playtupus Platypodes Duck mole Duck billed platapus Duck-billed platypus Ornithorhyncus anatinus Platypuses Ornithorhyncus Ornithorhyncus paradoxus Platypus Beaver duck Ornithorhynchus Ornithorhynchus Anatinus Duck Mole Plata-ma-pus Mallangong Platypi Duck Billed Platypus Duckbilled platypus Duck-Billed Platypus Platapus Ornithorhynchus anatinus Platipus Duckbill platypus