system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why are deer extremely sensitive to even the quietest sounds (rustling leaves), but run out in front of cars like they don't hear them?

Please excuse me or let me know if this has been posted before. I did both a reddit search and a google search and found nothing. If this has already been addressed, let me know and I'll just delete this post.

So, deer are notoriously sensitive to even the slightest sounds, right. But cars are loud. Cars traveling at higher speeds on highways are loud. Still deer run out in front of them despite how much louder cars are than, you know, light footsteps on leaves, for example.

But why? Is their hearing more sensitive to a certain kind of sound than others or something?

**EDIT** I'm not asking about the deer in the headlights thing, or deer's vision, I'm asking about hearing. It has been established repeatedly that deer don't see well. Examine the title of this post and the text above this edit. Hearing. Not sight.
gpt
Maybe they hear the car but think it's farther away so they don't care. Like they hear it, 100 feet away and think the car can't possibly travel at 70 mph to hit me in time, so I'll just run across this road.