Assertion: tern's egg | /r/HasProperty | difficult to see
Facets:
value: extremely
type: DEGREE
Source sentences:
text: The eggs (and chicks) are sand-colored, and can can be extremely difficult to see.
text: This can also be a disadvantage in that the eggs and chicks are so difficult to see that human beach-goers often step on them when the nesting area is not fenced.