Assertion: pigeon's bird | /r/CapableOf | preen each other
Facets:
Source sentences:
text: Before mating, the birds would stand side by side, preen each other, and then clasp bills (which is decidedly not how John James Audubon illustrated it above; Craig wrote that "however great the value of this plate in other respects, its value as a record of the attitudes and habits of the species, is very little").