Sumatran rhinoceroses are capable of swimming, but they are not known for being strong swimmers. These rhinos are more adapted to their forested, hilly habitats rather than aquatic environments. While they may occasionally cross small rivers or streams in search of food or to move through their territory, they are not aquatic animals.
Swimming is generally not a significant part of their behavior or lifestyle, and they are more terrestrial in nature. Their primary activities revolve around foraging for food, finding mates, and navigating through the dense rainforests where they live.