I have seen a lot too. Like, if you put in the jump code with an action replay, go to the ocean, jump into the water and go down and over a few. You can see a whale's shadow. It is huge! Also, Rooku, I wish you could have a pony you could ride too, if you haven't allready. I think the whale shadow is on www.animalcrossing-community.com
http://i7.tinypic.com/4lrvng5.jpg