Re: Is the Klingon D7 Class and K'Tinga Class Battlecruiser the same s
It really isn't that implausible at all that term "warbird" originated with the Klingons. In TOS, the Klingons and the Romulans apparently entered into an alliance against the Federation (Romulans were using the D7 design and it seems Klingons gained cloaking technology). It really wouldn't be that hard of a stretch that the Romulans started referring to their bird-shaped ships as warbirds too and the name stuck.
"There's always someone wanting to ruin a good party..."