In the history of philosophy, the concept of self has been perennially elusive.
The philosophical quest to understand the self is rife with phenomenological and
metaphysical analyses, often overlooking other kinds of selves present in the biological
realm. To systematically explore this question of non-human selves, I categorize the
literature on philosophical and biological notions of self into the biogenic, the zoogenic,
and the anthropogenic approaches to self. This article attempts to chart the genesis,
the continuum, and the lowest bound of the self. Further, I enumerate challenges in
developing a biogenic approach to self or taking the concept of self all the way down in
the phylogenetic tree.