Assertion: alimentary canal's cell | /r/CapableOf | proliferate in pigeon
Facets:
value: rapidly
type: MANNER
value: at the breeding season
type: TEMPORAL
Source sentences:
text: Many birds feed their young from the soft contents of the crop, and in pigeons, at the breeding season, the cells lining the crop proliferate rapidly and are discharged as a soft cheesy mass into the cavity, forming the substance known as pigeon's milk.