OP, let me take a stab here.
The Universe is a living, breathing, thinking entity referred to by Christ as the 'father'. The Father via 'thought' created the Earth.
Dinosaurs evolved on Earth. The same way all other life forms were in the process of evolving before Elohim(god/lucifer/angels etc) came from the sky
and intertwined their own DNA into man.
They(dino) are responsible for creating much of the wilderness you see today. That was most likely their main purpose.
At some point in history the atmosphere on Earth must have changed just enough that one day the great 'beasts' literally crumbled into pieces from
the pressure. Evident by the thousands of pieces of remains we generally find for each 'beast'.
Now, some of the smaller dino's survived. They eventually evolved into what we call 'birds' today. These 'birds' carry on the same duties as the
ancient Dino performed in its day.
P/S- It would not be wise to create a species such as cro-magnon without first altering the atmosphere just enough to eliminate or reduce the size of
a creature that would prey upon that species. It would be counter productive, no?
This is all my own opinion, of course ..


I love that...He just felt like it...That very well could be the answer... 