Assertion: plover's call | /r/HasProperty | variable
Facets:
Source sentences:
text: Its calls are variable, often low-pitched trilled or gurgling whistles.
text: Its calls are variable, often low-pitched trilled or gurgling whistles.
text: Its calls are variable, often low-pitched trilled or gurgling whistles.
text: Its calls are variable, often low-pitched trilled or gurgling whistles.