Mysterious humps in the river

I was gazing at the river on a balmy day and  lazily took one or two pictures. I didn't even notice at the time but I seem to have captured three mysterious humps in the waters.  The River Ness flows out of a large body of water called Loch Ness. Could this have been a juvenile Nessie who has been inadvertantly carried downstream? Or am I just not used to this hot stuffy weather?
   Of course it could be an otter doing the backstroke.