Almost 600 harbour and 3,000 grey seals now call the Thames Estuary home, the latest seal survey by international conservation charity ZSL reveals.ZSL has been monitoring grey and harbour seal populations in the Greater Thames Estuary since 2013, and this year's count - completed by teaming up with military helicopter pilots based at RAF Shawbury - revealed how these two species are doing. ¿¿

Almost 600 harbour and 3,000 grey seals now call the Thames Estuary home, the latest seal survey by international conservation charity ZSL reveals.ZSL has been monitoring grey and harbour seal populations in the Greater Thames Estuary since 2013, and this year's count - completed by teaming up with military helicopter pilots based at RAF Shawbury - revealed how these two species are doing. ¿¿