Chris Bednar Split from marsupials and placenta mammals early Lay eggs Found in Australia, Tasmania, and Papua New Guinea Half of species extinct 5 extant species Ornithorhynchus anatinus Features Webbed feet Duck-like bill Flat round tail Venomous Habitat Fresh water Rivers Streams Threats Habitat loss Hunted Least Concerned Species Tachyglossus aculeatus Features Spines Long tongue Round snout Habitat Underground CO 2 resistant Avoids day time Swims Threats Habitat loss Introduced predators Least Concern Species Zaglossus attenboroughi Zaglossus bruijni Zaglossus bartoni Features 3 types Long digging snout Habitat High mountains Shrubs Grasslands Threats Hunting All 3 Critically Endangered Unsuccessful human breeding Sir Davids extinct? otreme.html /monotreme