monotremes

/M AH0 N AA1 T R IY1 M Z/
noun
  1. 1

    A mammal that lays eggs and has a single urogenital and digestive orifice. Only the echidnas and platypuses are included in this group

Source: https://en.wiktionary.org/wiki/monotreme, https://en.wiktionary.org/wiki/monotremes