While many animals were on Noah's Ark, they had all finished evolving from dinosaurs millions of years before the Great (Local) Flood which wiped out the human civilizations populating the Middle East of the time. With few exceptions these animals were very similar to the animals that we have today.
Rom 3:4 God forbid: yea, let God be true, but every man a liar; as it is written, That thou mightest be justified in thy sayings, and mightest overcome when thou art judged.
If the flood was only local, God sure wanted us to think it was global.