iNat-Neolithic
It is a rock engraving on El-Hamra cliff in El-Ghicha (Algeria) which represents Equus africanus.
African wild donkey preceded by his two gambolling little ones. The "Naturalist" has shown all the characteristics of this animal; bristly mane, cross of withers, chevrons of the legs and bushy tail at the end. The eye is marked only by a horizontal slit or circumference with a small central circle, the eyelid is drawn to make it appear open.
So we can consider it as one of the oldest observations of iNaturalist.
(Location: https://goo.gl/maps/b87VQEqnhfPxHKRt5)