'You're a Rat.' 'Why, thank you!'

And we thought we were the only ones with empathy and a moral code. Rats will free a trapped rat and even leave food for him/her: http://www.sciencenews.org/view/generic/id/336819/title/He%E2%80%99s_no_rat%2C_he%E2%80%99s_my_brother