Cat and fish
If you have an aquarium and a cat in your house, then you know what it looks like! Cats can watch aquarium life for hours! It's probably a good idea to keep the top of aquarium closed by covering it with glass, because your cat could easily to jump into it and catch all the fish out!
F = Fishtank (my moose, my fishes, my cat), a photo by Frizztext on Flickr.
