A small dolphin, thought to be a baby, has been spotted swimming in the Thames near Embankment Pier.
The dolphin spent around two hours swimming in the area before it headed off in the direction of Tower Bridge.
It was filmed by shore staff at the Thames Rib Experience, which runs boats from the pier.
Lottie McCullagh, who spotted the dolphin, said she was shocked when she first saw it.
The most famous visitor to the Thames in recent years was a five metre long bottlenose whale spotted in January 2006. Sadly the whale died as attempts were made to rescue her and return her to the sea.