Monotremes lay amniotic eggs. Monotremes include just the platypus, the short-beaked echidna and the long-beaked echidna.
There are two mammals that lay amniotic eggs. The two mammals that lay amniotic eggs are echidna and platypus.
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All present day mammals lay amniotic eggs. The amniote embryo is protected from the harsh land conditions via a set of membranes.