関連ワード:
is a duck billed platypus a marsupial is a duck billed platypus a mammal is a duck billed platypus a rodent is a duck billed platypus a mammal that lays eggs is a duck billed platypus a placental mammal why is a duck billed platypus considered a mammal why is a duck billed platypus called a mammal when it lays eggs why is a duck billed platypus called a mammal is a duck billed platypus the only mammal that lays eggs is duck billed platypus a true mammal
