For it is unknown what is the real nature of the soul, whether it be born with the bodily frame or be infused at the moment of birth, whether it perishes along with us, when death separates the soul and body, or whether it visits the shades of Pluto and bottomless pits, or enters by divine appointment into other animals.
LucretiusMany animals even now spring out of the soil, Coalescing from the rains and the heat of the sun. Small wonder, then, if more and bigger creatures, Full-formed, arose from the new young earth and sky. The breed, for instance, of the dappled birds Shucked off their eggshells in the springtime, as Crickets in summer will slip their slight cocoons All by themselves, and search for food and life. Earth gave you, then, the first of mortal kinds, For all the fields were soaked with warmth and moisture.
Lucretius