Assertion: hippo's nostril | /r/AtLocation | top of the muzzle
Facets:
Source sentences:
text: The nostrils are also located on top of the muzzle so the hippo can stay mostly under water and still breathe and sniff the air.
text: hippopotamuses can not breathe under water or dive, therefore their nostrils are located at the top of the muzzle, and muzzle always protrude above the water.