When not in use, it's retracted by a woodpecker, & it may wrap around under the skull, beneath the skin
It 
burrows 1/4 inch holes and uses it's tongue to lap up the sap, not unlike... [DOC] [TLE] Intelligent Design: Woodpecker tongue | hiddeninjesus [PAR] Oct 21, 2012 ... To get a meal, the woodpecker buttresses its tail against a tree trunk, forming ...