Aquatic mammals are also known to inhabit the Thames. The population of grey and harbour seals numbers up to 700 in the Thames Estuary. These animals have been sighted as far upriver as Richmond. Bottlenose dolphins and harbour porpoises are also sighted in the Thames.
Aquatic mammals are also known to inhabit the Thames The population of grey and harbour seals numbers up to 700 in the Thames Estuary These animals have been sighted as far upriver as Richmond Bottlenose dolphins and harbour porpoises are also sighted in the Thames