2. Rats never leave their kind behind –  Science has taught us over the centuries that animal behavior that seems random or horrible on the surface takes on a whole new light if you watch it long enough. Rat watchers have seen them exhibit some pretty loyal, altruistic behaviors with each other. Ironically, finding this out required scientists to set up a cruel Saw-like chamber of psychological torture where the agonizing rat was shown sympathy by the other rat watching it. In a clear show of empathy, the rat even ignored a pile of treats nearby, displaying that he wasn’t after any reward but he just wanted his friend back.