Teams of volunteers carried out a count by air, land and water of grey and harbour seals in the Thames Estuary for the Zoological Society of London (ZSL) survey, sighting 708 animals! The survey, last August, was the first large-scale survey of grey and harbour seals carried out by scientists in the Thames estuary. The aerial element enabled researchers to count seals on the outer sandbanks of the estuary where colonies of up to 120 seals were recorded in remote and undisturbed spots away from people and boats.
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