[Byleth studied the little bird for a long moment, and said aloud that which Dimitri wisely and politely kept within his internal monologue.]

I'm unfamiliar with the sexual dimorphism of this particular species of... bird. There's a way to sex one by examining the cloaca but...

[............well. It's. It's examining the cloaca of an animal in public. Even Byleth had some semblance of tact in that respect (yet not enough to keep the thought firmly in his head).]

In any case, they understand human speech. Excuse me, can you indicate your sex? One peck for male, two pecks for female, or three pecks for neither.