The term 'Down Under Hopper' refers to two animals native to Australia: the Roo (3 letters) and the KANGAROO (8 letters). The Roo is a small marsupial, usually found in open grasslands and woodlands. The KANGAROO is a large marsupial, typically found in open grasslands and woodlands, and is known for its ability to hop long distances. Both animals are iconic symbols of Australia and are often featured in popular culture.