For cichlids, urination is also a form of communication
                                
                                
                                    (Newser) -
                                    Perhaps you know someone who's written his name in snow, you know, with urine. That's essentially what some fish do every day. In a  study  titled, "To pee or not to pee: urine signals mediate aggressive interactions in the cooperatively breeding cichlid," researchers explain that urination...