Whales in London

no thats not the country ! I had heard the the river Thames was supposed to be really clean now-adays (I wouldn't drink from it though), and that they had seen fish in the river, but today, the BBC report not 1 but 2 BIG whales had been spotted in the Thames. Apparently people have been flocking to the bridges over the river to catch a glimpse of these magnificent creatures. And its not April 1st yet either.