English: Four of the five extant monotreme species: platypus (top-left), short-beaked echidna (top-right), western long-beaked echidna (bottom-left), and replica eastern long-beaked echidna (bottom-right).
Constituent files:
File:Platypus BrokenRiver QLD Australia.jpg
File:Long-beakedEchidna.jpg
File:Echidna in the Karawatha Forest - Radford.jpg
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Four of the five extant monotreme species: platypus (top-left), short-beaked echidna (top-right), western long-beaked echidna (bottom-left), and eastern long-beaked echidna (bottom-right)