From National Geographic: Dolphins, Seals at Home in London's Reborn River.
Posted on April 22, 2005 03:13 PM. Filed under: environment.More than 130 seals have been spotted in the Thames since last August, according to the Zoological Society of London. Bottlenose dolphins have been seen upstream of London Bridge. And last summer the first sea horse was recorded in the Thames estuary in 30 years.
With 120 fish species, hundreds of thousands of birds, and a thriving fishing industry, the river now ranks among the cleanest metropolitan tideways in the world.
Ecologists say the Thames owes its revival to pollution control, which has vastly improved water quality. [continue]