[kkindt]

Evidence that humans and dragons existed at the same time:
1. stories of humans interacting with such beasts proliferate throughout all cultures on the earth - from China to Europe and to Americas.
2. The Komodo Dragon can grow up to 20 feet in length, it runs faster than any human, can swim and climb trees and its mouth filled with razor sharp shark like teeth are armed with poisonous saliva - there is evidence these creatures existed elsewhere besides these islands but were killed off by humans.
3. There are writings about such creatures that go back over 4,000 years ago

[Junior]

Many of the writings and legends can be attributed to the finding of dinosaur bones (the ancients had no way of knowing when the animal lived). Indeed, the legend of the griffon can be traced directly to the discovery of protoceratops remains in the far east. Also, you have the phenomenon of "traveller's tales." If you take all legends at face value, there were giant gold-mining ants in the Middle East and Africa was populated by dog-faced men [1], men without heads, men with only one leg, etc.

BTW, kimodo dragons are not dinosaurs. They are reptiles (complete with the splay-legged stance and commensurate senuous gait -- unlike the straight stance of dinosaurs, birds and mammals).

[1] Probably a twisting of recounts of baboons and Egyptian wall paintings of their gods.