There were grisly feasts beneath the moon, across whose red disk a bat-like shadow incessantly swept.> - Queen of the Black Coast
Though bat-skins are sought after by warlocks and witches, they find little traffic among the common merchants of Hyboria.
In the Exiled Lands, the bat demons - once used by the Giant-kings as messengers and transport - have turned feral, nesting in the rooves and high places of the land. Their skins might be large enough to use for some purpose.
