All the war between humans on earth.  Competition between animals for various aspects:  government control, basic rights, religious belief, territory conflicts.  

I love watching animals go at it– their conflicts exist on a primal level, and the competing species are inequal.  When your life is at stake and you give it all you have, how do you behave?

Cobra vs. Mongoose

Octopus vs. Shark

Cat vs. Fox

Raccoon vs. Possum