Assertion: river dolphin's eye | /r/CapableOf | lack lens
Facets:
value: despite river dolphins
type: OTHER
Source sentences:
text: Despite having small eyes (Ganges and Indus river dolphins’ eyes even lack a lens), river dolphins navigate muddy waters with ease thanks to exquisite sonar—perhaps the best among all the cetaceans.
text: Indeed, these dolphins have very small deep-set eyes that lack lenses and are probably only useful for detecting light and dark.