It's pretty much standard practise in most armies not to leave a wounded buddie out on the battlefield. One fairly often hears of braveheart jarheads hot-stepping through a barrage of bullets to bring back half a wingman's leg.
Until I saw the vid embedded below, I wasn't aware that squirrels also live by such an admirable code of conduct. Check out the way this little soldier fends off all those crows circling his dead homie's carcass. Moving stuff. I'll never consider squirrels go be opportunist nut addicts ever again.