Bernard Spragg/Flickr The Thames Estuary, downriver from the British capital London, is home to a growing number of seals. Zoologists recently estimated 600 harbor seals and 3,000 gray seals in the mouth of the river, an “incredible recovery from the early 2000s,” one scientist told the BBC, when the marine mammals’ populations were devastated by a virus. It’s part of a wider story of recovery for Britain’s biggest river, declared “biologically dead” in 1957 but now home to “a wide variety of British wildlife including seals, seahorses and critically endangered eels,” according to a zoological report. The Seine in Paris and the Potomac in Washington, DC, have seen similar turnarounds thanks to conservation efforts. |