Desmodus(bat)
Eats nothingFlyerNot rideable
Desmodus, one of the creatures of ARK.
Method
Cannot be tamed
There is no way to tame this.
Taming
Desmodus has no taming data on the wiki, so there is nothing to calculate. That usually means it cannot be tamed at all, but it can also mean the numbers have not been published yet.