Assertion: hippo's ear | /r/HasProperty | positioned on top of their heads
Facets:
Source sentences:
text: Their eyes, ears and nostrils are positioned on top of their heads, allowing hippos to remain aware of their surroundings while almost entirely submerged in water.
text: The eyes, ears, and slit-like nostrils are positioned on the top of the head so that it has full use of its senses while the body and majority of the head are submerged in water.