Okay they say they are blind ... but !
It seems , especially near the end , that the aliens are not only stalking by sound but also by sight , despite the family not making a sound.
sharewhat scene(s) imply that they can hunt by sight?
I saw some indication of hunt by smell (maybe blood) in the scene where the Mom steps on a nail and it seems to follow her around the house and the creature was making some sounds that maybe was sniffing...
Spoiler ! ..... At the end when the kids run back to the house after the father sacrifices himself .... they are with there mom and not making any sounds but the alien seems to know to come down that path towards them !
Prob more instances but only seen it the once .
I'll need to see the scene again, but from what I remember I do agree with FredBurroughs... at that point they were all scared and breathing hard.
Also at that point the creature was very suspicious of this house for past loud noises. And most importantly the creature was in very close proximity so was probably more sensitive to even loud breathing at that point.
They could have followed the sound of the truck wheels going down hill. And at least one of the beasts had been in the house basement and left so they maybe remembered the way.
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