Question

Which mammal lay eggs?​

Answer 1

Answer:

The Extant (Currently Alive) Species of Egg-laying Mammals Are:

The Duck-Billed Platypus.  

The Short-Beaked Echidna.  

The Eastern Long-Beaked Echidna.  

Sir David's Long-Beaked Echidna.

Western Long-Beaked Echidna.

Answer 2

Answer:  

The Duck-Billed Platypus. ...

   The Short-Beaked Echidna. ...

   The Eastern Long-Beaked Echidna. ...

   Sir David's Long-Beaked Echidna. ...

   Western Long-Beaked Echidna.