Predators should smell blood

As the title says, some predators such as wolves, bears etc should be able to smell fresh blood. This feature would be crucial if it comes to hunting and butchering as well when we are wounded and losing blood. Predators may spawn in some distance when we are butchering a bear and we would be forced to fight for the carcass. Moreover, we may be in trouble if a wolfpack smells our blood that comes from our fresh wounds

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but does blood smell?, i mean so far i believe blood is only a visual effect