関連ワード:  why is platypus a mammal if it lays eggs    why is a platypus a mammal when it lays eggs    why is a platypus considered a mammal if it lays eggs    why is platypus called mammal when it lays eggs    if a platypus is a mammal why does it lay eggs    why is a duck billed platypus called a mammal when it lays eggs    is the platypus the only mammal that lays eggs  
結果 : why is platypus a mammal if it lays eggs