Assertion: pigeon's bird | /r/CapableOf | clasp bill
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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").