Assertion: sea urchin's food | /r/HasProperty | favorite
Facets:
Source sentences:
text: During the unavailability of their favorite food, several species of sea urchins turn to new food varieties which may include remains of dead animals, sponges, mussels, sea cucumbers and other tiny ocean creatures.
text: Kelp, or seaweed, is one of their favorite foods.
text: However, their favorite food is algae.