Assertion: pygmy hippopotamus | /r/HasProperty | one of only two extant species
Facets:
Source sentences:
text: The Pygmy Hippopotamus is one of only two extant species in the hippopotamidae family, the other being the much larger hippopotamus.
text: It is one of only two extant species in the Hippopotamidae family, the other being its enormous cousin the common hippopotamus.