The survival of the fittest.. Everything has there own rights, but right vary depending on your species. I see certain animals (Cows, chickens, etc) were placed here for others to live on (for there food and such). Do plants have rights? Animals eat them :P
Remember when you were in Elementary school and you would make people spell "I C U P" or something like that? Good times. What kind of words did you make up for people to say? One of mine was, "Alpha-uk-any-one"
((sorry for double posting)) Animals kill each other for a reason, may it be territory or food or something of that matter. Humans kill each other for little reason though too.
Towards your point of Beavers build houses, fish swimming, etc... Fish can swim right? But can they build houses as well? Can they run 500 meters? Do they ski? No.. Humans are most diverse in ways to live, we can do alot of things, may not be perfect, but we sure can do alot.
I think we will lose our Pinky Toes. With shoes, we've lost most use for it because we were designed to have toes to hold us up, but now we have big rubbery bedding doing that instead. Eventually we will be 8 toed humans :D
You're missing the point of emulators.. The point is to go back and experiance how things were... not re-create them and ruin them. *cough* rsc and rs2 *cough*