The Isle of May is celebrating its first-ever Seal Open Day on Sunday, 23 September, opening a new world for visitors used to coming to the island to see its seabirds. Up to 100 grey seals can be seen around the island at any time of year, but their numbers increase in Autumn and Winter when up to 4,000 seals haul themselves onto the rocky shores of the island to have their pups and mate. This makes the Isle of May the fifth largest breeding colony of grey seals in the UK, and the largest on the east coast of…