Assertion: snail | /r/CapableOf | retract all four tentacles
Facets:
value: into the head
type: TRANSITIVE-OBJECT
value: by invagination
type: MANNER
Source sentences:
text: The snail extends the tentacles by internal pressure of body fluids, and retracts all four tentacles into the head by invagination when threatened or otherwise retreating into its shell.