OK, first of all this is not a trolling post.
Secondly i understand the theory of evolution (at a basic gcse level)
So let me put some maths to my post.
In terms of mammals, the earliest mammal dates to 200M years ago.
If the average lifespan of a mammal is 10 years then there are
20m generations.
If a genetic mutation/variation occurs every fifth generation thats
4m genetic variations.
Only a certain percentage of those variations would be successful or advantageous, lets say 50%
2m variations.
Is that really enough to allow such a vast array of mammals to exist?