You have to watch this hilarious video of a pair of red squirrels fighting.
My favorite bit is around 0:06, check out how the squirrel in the back gets into this stiff feet-sideways penguin like stance and does like a little moonwalk before lunging at the other squirrel.
The funniest thing though is how they still manage to fit in 1 second of eating for every 10 seconds of fighting.
