dik-diks Dikdik
Oribi is a small African antelope
eland
kudu
The dik-dik is a small African antelope that lives for months with no water except for dew and the moisture in its diet of vegetation.
gnu
oribi
dik dik
oribi
Dik-dik, it is small antelope that lives in the bush of East Africa
I think the answer is SUNI
suni
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.