Assertion: spider's silk | /r/HasProperty | webbed den
Facets:
value: for protection from the environment
type: PURPOSE
Source sentences:
text: Silk is utilised by spiders for a variety of functions, including the building of sticky webs, safety lines, webbed dens for protection from the environment, wrapping up prey or offspring, use as a net or lasso for catching prey or as a kite to take the spider airborne.