Subfamily Hydromyinae is a group of rodents known for their unique aquatic habits. Some synonyms for this subfamily include water rats, rakali, and freshwater rats. These rodents can be found throughout various regions of the world, including Australia, New Guinea, and South America. They have adapted to their aquatic environment, with specialized features such as waterproof fur and webbed feet. Hydromyinae are also known for their high intelligence and playful behavior. Due to their ecological significance, these rodents have been studied extensively by scientists, and their habitats have been a focus of conservation efforts.