I vaguely remember reading that naked mole rat colonies do something similar. They have a piss room that they all use and they'll make sure to roll around in it to get themselves coated in the smell. If they come across any other naked mole rats in the wild and they smell like different pee, they'll know they've run into a sworn enemy and fight

So if one of them ever gets caught in the rain? They’re “dead to me”

Gotta stop at the piss room before anyone finds out