Seal spotted swimming in the Thames near Billingsgate Fish Market

A seal has been spotted swimming in the Thames near Billingsgate Fish Market - presumably for any left overs.

'Common seals’ and grey seals are known to be found in the Thames Estuary along with harbour porpoises and occasional dolphins and whales.

London Zoo began counting in 2004, and has logged 352 common seals and 506 grey, 261 harbour porpoises, 23 dolphins, and 305 unknown seals.