Assertion: black swan's feather | /r/CapableOf | replace the feather
Facets:
Source sentences:
text: When the cygnets are 4 weeks old, the scapular (shoulder), tail and flank feathers are replacing the feather down.
text: When they are 4 weeks old, the shoulder (scapular), tail and flank feathers are replacing the feather down.
text: When they are 4 weeks old, the shoulder (scapular), tail and flank feathers are replacing the feather down.