Assertion: porcupine's quill | /r/HasProperty | hard
Facets:
value: on these particular arboreal species
type: OTHER
value: really
type: DEGREE
Source sentences:
text: Until their quills are hard enough they will remain in their nest.
text: A group of scientists studied this phenomenon and found that the tip of each quill has a tiny rear-facing spike, meaning that the quills easily penetrate the surface but are hard to remove because of their hook shape.
text: Each quill is hard, hollowed hair whose interior consists of numerous air pockets.
text: On these particular arboreal species, quills on the tail are really hard, tough and also points backwards enabling them to stay and climb on the tree branches.
text: The work, which also explains why the quills are so hard to remove, could improve the design of a variety of medical instruments, from devices that poke us to those that help keep wounds shut.