Assertion: crag martin | /r/HasProperty | ptyonoprogne rupestris
Facets:
Source sentences:
text: The Eurasian Crag Martin or just Crag Martin, Ptyonoprogne rupestris, is a small passerine bird in the swallow family.
text: The Crag Martin, (Ptyonoprogne rupestris), is a small perching bird in the swallow family.