Question

Are the fleshy bulges at the back side of a bps where bps sense vibrations?

Fleshy bags? Dont think i've seen those before?

Basicly the back of a bps head.

I always thought they sense vibrations through their jaw or something like that. Heard that somewhere anyway...

I think I know what you're talking about though. The wider part of the bp's head? I think that's just the shape of their bone structure. Unless you're talking about the top of the bp's head...where there's two bulgy things. I think that's their brain. Dunno, lol.