My dad sends an interesting thought experiment called The World Without Us. It's an interactive page showing what would happen if humans suddenly went extinct.
There's a big honeycomb looking hexagon on the north pole of Saturn. Four earths could fit inside of it. I think giant bees live on Saturn.
If humans went extinct, I would think that the world would be overtaken by Monchichis.
Speaking of survival of the fittest and extinction...
The question is: What orbits around the earth?
A) The moon
B) The sun