Just a quick idea for a rat eyeing a piece of cheese. Six, maybe seven seconds when it's through.
Animation of a rat batting a piece of cheese from a trap. Trap and cheese omitted for clarity. Work in Progress... some parts work, and others are kind of sticky. Rats are fun- they are easy to draw and classically smart. It's understandable why they make good cartoons.
Then there's the video (complete with timing issues)-