Assertion: martin's nest | /r/HasProperty | collected for example
Facets:
value: from february
type: TEMPORAL
Source sentences:
text: While the collection is regulated in some areas (at the Gomantong Caves, for example, where nests can be collected only from February to April or July to September), it is not in others, and the swiftlets are declining in areas where the harvest reaches unsustainable levels.