How many species of animals belong to Giraffidae family (where giraffe belongs)?

one
1209
two
6626
three
2377
four
877
This family, once a diverse group spread throughout Eurasia and Africa, presently comprises only two extant members, the giraffe (the only living species of Giraffa) and the okapi (pictured, the only living species of Okapia).
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Przemek
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