Assertion: sea slug's food | /r/HasProperty | sponge
Facets:
value: usually
type: DEGREE
Source sentences:
text: Their food is usually sponges, hydroids, sea anemones etc, and other colonial animals which are even more difficult than nudibranchs to keep alive in aquaria.
text: It turned out that its most preferred food was a sponge which had been accidently introduced into New Zealand from Europe, only 2 or 3 years before.