Prototherians are either terrestrial (Tachyglossidae) or primarily aquatic (Ornithorhynchidae). Their terrestrial habitats include deserts, sandy plains, rocky areas, and forests in both lowlands and mountains. Platypuses inhabit lakes, ponds and streams; they shelter in burrows along the banks and spend much of their time foraging in the water.
Habitat Regions: temperate ; tropical ; terrestrial ; freshwater
Terrestrial Biomes: desert or dune ; savanna or grassland ; forest ; scrub forest ; mountains
Aquatic Biomes: lakes and ponds; rivers and streams
Other Habitat Features: riparian