if humans had never even turned up, the earth would be MUCH different, and yes i think more animals.
I mean, the human race threw evolution into a strange spiral.
Our towering metal structures, our destruction of forests and previous unawareness of... everything-ness.
i think many animals would look completely different, more of the earth would be inhabited by interesting creatures, and the earth would look like something completely different, sea life would go through the roof as-well (Like it hasn't already)
i am just rambling with random opinions here so please take no notice of the above.