With many species, there is basically no risk. While an escaping bear or tiger is of course a risk if you run into that individuum, humans are far too good at d

With many species, there is basically no risk. While an escaping bear or tiger is of course a risk if you run into that individuum, humans are far too good at dealing with those species, as the constant extinction-risk for their modern cousins shows. Most of the damage to ecological systems is done today by invasive species, which are either actively brought to new regions or travel secretly along with humans.