Assertion: stork | /r/CapableOf | lack syrinx
Facets:
Source sentences:
text: Amongst birds, storks are interesting because they lack a syrinx, the avian "voicebox", which renders them mute, so they use bill-clacking to communicate with their mate.
text: Storks lack a syrinx and are mute.
text: Although it is sometimes reported that storks lack syrinxes and are mute, they do have syrinxes, and are capable of making some sounds, although they do not do so often.