Mice don't live in the houses of people who will be mean to them, and they certainly don't carry any diseases. Natural selection is alive and well. The animals hunt each other and some will die while others survive. There are domesticated animals, much like on Earth, but nobody raises animals to slaughter. All the animals that are used to feed people are fed only organic food and are free-range.
Maple keys fall all year.
It exsists in a demension parallel to our own. The weather would be seasonal as is our own. All life forms would be the same. The only difference would be that we would live as we were suppose to according to the Great Spirit. This would be were we as people go when we have finished our mission on Earth 1.