However, this statement is incorrect.
* Giant antelope do not have trunks. They are members of the Bovidae family, which includes cattle, sheep, and goats, and do not possess trunks.
* Elephants are the only animals with trunks.
* Ancestors of giant antelopes would also not have had trunks.
There might be a misunderstanding about the specific giant antelope species or a mix-up with a different animal. Could you clarify the question?