I have found that when deer otherwise feel secure, they can be very curious creatures....sometimes. I watched a doe follow an armadillo for 50 yards while she was in creep stance the whole time. The woods were pretty thick and I don't think she ever did actually see the armadillo. I have also heard deer snort before but not run off, and three other deer that were not even aware of the snorting deer walked immediately to where the first deer snorted to check everything out.