There are only five species of monotremes in the world, all found in Australia and New Guinea:
* Echidnas: There are four species of echidnas, which are covered in spines and have long, sticky tongues for eating ants and termites.
* Platypus: The platypus is a unique, duck-billed mammal with a venomous spur on its hind leg.
Monotremes are fascinating creatures that bridge the gap between reptiles and mammals, showcasing a unique evolutionary path.