Assertion: heron's back | /r/CapableOf | point their bill
Facets:
value: upwards
type: MANNER
value: to initiate preening
type: PURPOSE
Source sentences:
text: The male's nuptial display involves low grating calls and bill clapping, stretching the wings and their necks, bowing and arching backwards so that the head is above the back pointing their bill upwards to initiate preening.