First off, that's actually the coolest name for a bird that I've ever heard.
Second, I don't think the birds would be bothered if they found out. They have no conception of what either Satan or a jar is. I'll give credit that they can differentiate day from night. The rest would just be nonsense to them.
Some authors report that in flight, the bird makes a "plip-plop" call like dripping water, which locals have also likened to the sound of the bird pulling out a person's eye.
How do the locals know the sounds of pulling out a person's eye?