Assertion: green sea urchin | /r/CapableOf | scrape the surface of rocks
Facets:
value: in search of diatoms
type: PURPOSE
value: in algae
type: LOCATION
value: often
type: TEMPORAL
Source sentences:
text: Often, green sea urchins scrape the surface of rocks using their "Aristotle's lantern," or masticatory apparatus, in search of diatoms as well as algae.