Yeah, and the waterfall blocked their hearing entirely. Might be a good idea to go live there, even. Especially if you’re, y’know, pregnant.

And some random guy in his house discovers the sound that messes them up. Apparently the military failed to try playing loud sounds at aliens with super sensitive hearing. Just never occurred to them to try that I guess.

Annddd, if their hearing is that crazy sensitive, they’d be jumping at every random raccoon fart and bird dropping. There’s no way they could pick humans out over any distance. Sound is just a pressure wave through a medium, and doesn’t actually get that far with an appreciable amount of energy left over. These things would have to be everywhere to be such a threat, yet you hardly see any in the movie.

Maybe entertaining, but it holds up to precisely zero scrutiny.