While I very much agree with most of what you say Fishnhunt I will say the park is very much a natural environment. Humans are the only creature that God gave higher intelligence to and we are dominant over all the other creatures because of that. Unfortunately with that higher intelligence we often make mistakes (aka otter reintroduction). But humans have been moving animals from one place to another for thousands of years, killing off some species we didn't like and domesticating still others. If humans moving an animal somewhere or killing off existing animals makes it not a natural environment anymore then all natural evironments were gone thousands of years ago. It may take a few hundred years but the otter thing will balance out as all things do. As smart as we are we can't outsmart God and as much as we like to think we are playing God its intersting to me that no matter what mistakes we make they seem to be washed away with the hand of time or God.