breadcrumbs adds a certain chance of getting the head of any animal or mob in the game when killed. As is currently the case in Minecraft with certain mobs. With this mod the probability of getting the head increases, in addition to the fact that we can get all the heads, even those of creatures added by other mods.
We can use all these heads, both to decorate our constructions, and to put them on our character, placing them where we would normally put the armor helmet. Although it does not provide us with any type of defense, it is only an aesthetic function.