Monotremata

• Ornithorhynchidae
• Tachyglossidae
• Kollikodontidae
• Patagorhynchus
• Steropodontidae
• Teinolophidae
• Platypus Ornithorhynchus anatinus

  An egg-laying mammal that forages in Australian rivers.

• Short-beaked echidna Tachyglossus aculeatus

  A spiny egg-laying mammal found in many Australian habitats.

• Western long-beaked echidna Zaglossus bruijni

  The western long-beaked echidna is an egg-laying mammal with a long, downward-curving snout. It occurs on New Guinea.