A three letter African antelope is the "gnu", which ends in a "u" not a "you". The more common name for the gnu is the wildebeeste, but that won't fit into your crossword puzzle.
Nyala
A gazelle is a type of antelope.
A gnu is a wildebeest, which is a type of antelope.
Gazelle.
Gazelle
Kudu
Oribi
The name comes from the Afrikaans spelling of rhebok, a type of African antelope or gazelle.
The Bongo is a type of antelope that has a brown coat with then white stripes. This is the largest of the African antelope species.
Gazelle
dikdik
· Bongo