While we're on the subject of non-human Terran sapience (and forgive me for taking this further off topic), have the elephants ever been confirmed in Trek works as standing alongside dolphins? On that count, have Trek works ever featured elephants at all? Given that the TNG episode "New Ground" established the extinction of the white rhinoceros, were the elephants equally wiped out?
Would that mean the humans are considered to have a history of unwitting genocide?
Titan: Orion's Hounds
mentioned Betazoid pachyderms as a dolphin-equivalent, so apparently Betazed has elephants just as it has humanoids. I suppose the Betazoids would have a lot less difficulty recognizing sapience; they could just scan and say "hello".
So, can anyone remember if the fate and intelligence of the elephants has ever been revealed in Trek?