[["The monotreme mammals lay eggs. Those are echidnas and platypus.", 2429.0], ["Only two: the spiny anteater (echidna) and the duck billed platypus. ", 951.0], ["The duck-billed platypus, short-beaked echidna, eastern long-beaked echidna, western long-beaked echidna, and Sir David's long-beaked echidna are the only five species of mammals who lay eggs.", 809.0]]
what mammals lay eggs
animals,mammals,platypus,mammal