My father used to tell me that deer have three main senses. Sight, Hearing, and Smell. If you think about it they do have large eyes, large ears, and long noses. His theory was that if you triggered two of those senses at a given time they would take off. I think cars blind them and the can’t smell it or sometimes hear it coming.
Once they are startled they tend to go back the direction they came from. GENERALLY… I have my doubts sometimes because I’ve seen deer get shot at and just stand there but I do believe my father to be mostly correct.
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