Assertion: bird's number | /r/HasProperty | debated
Facets:
Source sentences:
text: The number of extant penguin species is debated.
text: The number of species is a matter of debate.
text: The "albatross" designation comprises between 13 and 24 species (the number is still a matter of some debate, 21 being the most commonly accepted number) in four genera.
text: They are members of the order Sphenisciformes and family Spheniscidae, and the number of extant penguin species is debated, somewhere between 17 – 20 current living species in total.