Set sail along Kent’s beautiful rivers and discover herds of seals this autumn. The county is home to hundreds of marine mammals and eagle-eyed nature lovers can see them ducking and diving through the water on a seal-spotting boat trip. Recently, the Zoological Society of London (ZSL) found almost 3,600 seals in the Thames Estuary, which runs between Dartford and Margate, showing that the habitat is still healthy. The team counted the number of mammals laying out on sandbanks and estimated how many may be in the water, concluding a total of 599 harbour seals and 2,988 grey seals living in the…