Here is a fascinating subject. According to the bible , One of Adam's first assignments was to name all the animals including the sea creatures and dinosaurs of course. We don't know how long this took but, as all witnesses know, the time period is crucial in working out the timing of Armageddon).
For Adam to name the animals correctly and give them appropriate names he must have studied there behavior. He became an animal trainer par excellance and a marine biology expert. I estimate as a perfect man this may have taken fifty years.
Seeing Adam at the time was still in communication with his heavenly Father , he had source to great counsel.
He wasn't alone in his decision making.
I won't go any deeper now but just imagine what it must have been like to have dinosaurs under your personal subjection. For over 1,600 years people lived harmoniously with every animal