I am surprised that nobody has raised this issue? If elephants are smart enough to recognize an enemy, avoid it, and warn other elephants that have not seen this enemy first hand... do they qualify as people? They certainly seem at least as smart as dolphins, and their trunks allow for a crude form of tool manipulation that dolphins lack. We humans define our personhood in terms not just of raw intelligence, but also…
I think they do require agency/respect/laws fitting of a properly conscious being though. Often people put humans on a pedestal, but in reality, we aren't special in regards to morality.