Question: are echidnas related to platypus?
Answer: Echidnas (/ɪˈkɪdnə/), sometimes known as spiny anteaters, belong to the family Tachyglossidae in the monotreme order of egg-laying mammals. The four extant species of echidnas and the platypus are the only living mammals that lay eggs and the only surviving members of the order Monotremata.