Question

Which of these is one of the only two mammals that lay eggs?

wombat

duck-billed platypus

three-toed sloth

chicken

Answer 1

Chickens and duck-billed platypus both lay eggs.

If you can answer in only one I would go with the chicken, but that's just me. ;)

Hope I helped, have a nice day!

Answer 2

A chicken and a duck billed platypus.