Assertion: nightjar | /r/HasProperty | large portion of the skin
Facets:
Source sentences:
text: Upon opening the mouth of this kind of Goatsucker, which thoy can do so as to place each half of their beaks at a straight line with the other, a large portion of the skin beneath the eyes becomes stretched and quite free of feathers ; is as transparent as glass, so as to allow the eyes to see directly througli it into the mouth, or farther on in that direction.