Assertion: hermit crab's shell | /r/CapableOf | become available
Facets:
value: for smaller crabs
type: PURPOSE
value: for a cascade of shell updating
type: PURPOSE
Source sentences:
text: Living in colonies helps hermit crabs find new shells as when larger crabs find a new shell the old shell becomes available for smaller crabs and a cascade of shell updating may occur as progressively smaller crabs each upgrade their shells.
text: When a new, large shell becomes available, hermit crabs have been known to form a line by it from largest to smallest.