Monotreme in a sentence as a noun

> all surviving monotremes live in and around the water Wait, what?

And monotremes like the platypus, an animal that lays eggs but nurses its young with milk.

Clearly monotremes are similar to other mammals in many respects but very different in others.

The surviving monotremes are the platypus and several species of echidna.

Monotreme definitions

noun

the most primitive mammals comprising the only extant members of the subclass Prototheria