Raphael85: My problem is that to kill a boar, it needs 3 or 4 spears. On the bear 7. There are videos on YouTube where much less is enough. Boar 1 spear, and I until 3-4. Why?
I have seen the same thing. Bothered me a bit when I first started playing the game. But its likely some of those people used the option at the start of their game to lower the hitpoints of animals.
Also, as the game has devoloped over the months, they do tweak the damage of spears/bows from one version to the next, but from what I have seen that alone wouldnt be enough to account for the uncanny 'one-shotting' I saw in some of those vids.
I agree with ksj8ak2, the recurve with iron arrows is the current sweet spot. Using that combo on standard settings, rabbit, fox, deer, stag and pig are all 1-shot with a head shot, the bear and wisent the only exception with 3 or 4 hits to the head.
Crossbow (and I think longbow) does a bit more damage than the recurve, the last time I looked, but recurve makes up for this with a faster rate of fire.