Assertion: snake | /r/HasProperty | depend on their eyesight
Facets:
value: to hunt in daylight
type: PURPOSE
Source sentences:
text: It's concluded that the last common ancestors of all snakes had UV-sensitive vision, but that most snakes that depends on their eyesight to hunt in daylight have evolved lenses that act as sunglasses which filters out UV-light, and probably also sharpens their vision by improving the contrasts.