“......and why was there not ONE Pterodactyl on Noahs Ark?”
Ah, but there was! You see, Noah took two pterodactyl eggs, one boy and one girl, onto the ark with him. When they hatched on board, they went into immediate miraculous hibernation, just like the rest of the dinosaur passengers.
You didn’t know that?
Unless these eggs flew or walked unto him, they cannot "come unto" him....so they have to be hatched pairs.
Unless.....some Pterodactyls built a nest in the Ark when he was building it.