the capture of edible animals points to the time of the hunter culture, and the relation to the world beyond with cattle of the sun, a red island, and man-eaters probably belongs to shamanistic hunting magic
Burkert argues that the Heracles complex is rooted in a pre-Olympian shamanistic stratum, linking his labors to hunter-culture cosmology and his underworld descents to shamanic practice.
, Greek Religion: Archaic and Classical, 1977thesis