I have never seen this before. A sheep decided to swim out to munch at the lush grass/reeds growing in the lake....and yes I did see it come out before you decide to write to the RSPCA 8-)
Sorry Rory, you're wrong - look closely at the distincitve ears, yes, it is in fact an albino hippopotamus. Rare, yes, but very much at home in the water! ;-))) Keith