The beast in the water

I took this picture in Derbyshire, of a mysterious creature that was swimming in a lake at high speed. I will let you guess for a moment what this strange and unsettling critter is... Did you find out? It's an... otter. The picture was taken in an otter sanctuary. I had a look at it recently, when I was writing this post, and it struck me that this could easily pass for one of these pictures of lake monsters that folklore and cryptozoology are fond of. But no, the beast in the water was only a mundane otter. Which is just as well, because while I stopped believing in cryptids, I always loved otters.