Dolphins, despite being marine mammals, have adapted to freshwater habitats in some river systems and possess echolocation abilities.

The hippopotamus, native to Africa, is the largest freshwater mammal, weighing up to 3,200 kg and measuring up to 5 meters in length.

The platypus, found in eastern Australia, is a unique mammal that lays eggs and possesses a distinctive bill-like snout for foraging.

Manatees are primarily herbivorous and feed on a variety of aquatic plants, including seagrasses, algae, and water hyacinths.

Beavers are renowned for their dam-building behavior, creating structures that alter the flow of water and create wetland habitats.

The giant otter, native to South America, is scientifically known as Pteronura brasiliensis.

Manatees have adapted to hold their breath for up to 20 minutes while searching for aquatic plants to feed on.

Capybaras are found in freshwater wetlands, including swamps, marshes, and riverbanks, where they feed on aquatic vegetation.

Otters are skilled swimmers, using their webbed feet and powerful tails to navigate aquatic environments.

The muskrat, native to North America, is scientifically known as Ondatra zibethicus.

Otters possess long, slender bodies and powerful tails, allowing them to swim swiftly and maneuver through aquatic environments.

Beavers primarily feed on bark and wood from trees and shrubs, which they use to construct their dams and lodges.

Manatees are known for their ability to dive deep underwater and feed on various aquatic plants.

The platypus, native to eastern Australia, is scientifically known as Ornithorhynchus anatinus.

Muskrats are known for their ability to construct complex underwater burrows and tunnels, creating intricate networks of chambers and tunnels.