Assertion: gopher tortoise's shell | /r/CapableOf | get hard
Facets:
Source sentences:
text: At about five years old, the shell gets hard and it then becomes difficult for most animals to eat them.
text: When they reproduce, the young find a spot and stay put for a few years until their shell gets hard and they are not as vulnerable to predation.
text: Around 5 years old, the shell gets hard and becomes brown.