HIPPOPOTAMUS

The hippopotamus, commonly found in freshwater rivers and lakes across Africa, is not a sea-dwelling animal. Despite this, some confusion arises due to their semi-aquatic nature and association with water bodies. While hippos are excellent swimmers, they primarily reside in rivers, lakes, and swamps rather than in the sea.
Hippos spend much of their day submerged in water to stay cool, given their large, barrel-shaped bodies and sensitive skin. They are not designed for life in salty marine environments, as they require fresh water to keep their skin hydrated and avoid sunburn. Their habitat preferences also center around freshwater regions with ample vegetation.
While a few marine animals share some similarities with hippos in terms of size and aquatic adaptation, such as manatees and dugongs, hippos remain distinct due to their primarily land-based activities. At night, hippos leave the water to graze on land, covering several kilometers in search of food.
Evolutionary, hippos are more closely related to whales and dolphins than one might expect, as both share a common ancestor. However, this connection dates back millions of years, and today, hippos are entirely terrestrial and freshwater creatures.

In conclusion, while hippos are often associated with water, they are ill-suited for marine environments like the sea. Their biology and behavior are adapted to riverine and lake ecosystems, making them one of the unique giants of African freshwater habitats.