they hate the smell of dogs, and the hunter's smell of powder and alcool.
Working all day long in the forest i can tell you only females are dangerous, and only when they are followed by piglets (thanks for the one who will teach me the proper english word). Males often charge when feeling cornered, but just in order to flee (step out of it's way and everything will be nice, if you are paralysed by fear, sorry for you, you should not have gone hunting). Females are liable to be nasty if you really deserve it, meaning if you take no care of the warnings (growls).
Having no dogs, no gun and no alcoolic fragrance, the boars usually keep concealed in the bushes and let you pass by. If they hear or smell you in time they will just flee away, but since I'm a seasoned forester, I move without a sound and they often wait for me to pass by and then run in my back.
I can think of many, many much more dangerous species.
PS: for those who could say we only have toy boars in Europe, the biggest male killed this winter in my neighbourhood was more than 500 lbs.
edit: good point about the need to practice much before trying "primitive" weapons, Hosakawa
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