animals... are often social.... they need each other. love.. is a great evolutionary advancement... it helps a species. -MT
Our genes give us the potential for love, but that does not reduce the mystery or the beauty. In the animal kingdom, I think there is love, but also mere bonding.
Animals that nurture their offspring until they're able to look after themselves do it because hormonal changes trigger certain nurturing instincts that if the animal didn't posses, would mean the rapid extinction of that species.
Humans didn’t establish, language, philosophy, and ethics and then decide to behaving according to a logically established set of values. Morality is biological; it’s an indwelling behavioral adaptation that evolved because it increases the chances of survival of a community of social animals. Examine any social animal and you will be able to discern a system of behavioral morality. The only difference is that humans are able to conceptualize their morality and apply our cognitive skills to the topic. ~Raithere