Freshwater seals are a unique group of seal species that inhabit freshwater environments, such as lakes and rivers. Unlike their marine relatives, these seals have adapted to live in non-saline waters. One well-known example is the Baikal seal, which resides in Lake Baikal in Siberia, the world's deepest and oldest freshwater lake. These seals primarily feed on fish and invertebrates found in their freshwater habitats. They have developed specialized behaviors and physical adaptations to thrive in these environments, including the ability to dive and hunt in murky waters. Freshwater seals play an important role in their ecosystems, helping to maintain the balance of aquatic life.