Social Grooming in Pan troglodytes
Several species practice mutual grooming as a manifestation and reinforcement of social relations. The functions of this activity include communication, the maintenance of public health, bonding, reinforcement of societal hierarchies, and of course simple care for one individual by another. Here again we see the concept of love manifested in nature, not as a simple and meaningless abstract emotion, but as social love- a natural force within the animal psyche which drives individuals to care for one another and thus manifest and maintain complex societies to the mutual benefit of all.
Study of Social Love: Trophallaxis in Oecophylla smaragdina
Trophallaxis is the direct transference of sustenance between members of a society, practiced in many social species including insects and birds. It can also function as a kind of chemical communication. The biological inherency of the process in numerous species (some even have specialized organs to store food specifically for this process, colloquially known as “social stomachs”) demonstrates the existence of a natural psychosocial force within the animal psyche that drives the creation and maintenance of multi-organism social systems, a force which may term “love” for one another- love not as an inert emotion, but as an actual active biological drive to work for the common good of the species.