I've been thinking about this for a while, and I think it would be a cool discussion.
Assuming dragons existed (big assumption, but just for the sake of argument), around which time period do you think they left/went extinct/disappeared?
This came to mind because there are the dragon-like creatures in ancient mythologies around the world, but also there are the medieval stories. Could the dragons have survived until medieval times? Or even until today? (that bird-thing someone spotted in alaska with apparently a 15-ft wingspan. I'll see if I can find an article about it).

EDIT: okay I couldn't find a story about that particular sighting, but something similar in Pennsylvania - with what the people called birds. Read the 1st 2 articles.
http://www.s8int.com/eyewit27.html

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Now and then I announce "I know you're listening" to empty rooms. If I'm wrong, no one knows. And if I'm right, maybe i just freaked the hell out of some secret organization. It's basically Paschal's wager for the paranoid prankster.

~~ http://www.xkcd.com ~~

I would place their general disappearance circa 1300 AD, with some persistant sightings until today.

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The devil doesn't come dressed in a red cape and pointy horns. He comes as everything you've ever wished for.

-Tucker Max

I would agree with that date, but no later than that and possibly earlier. Sometime after Arthurs suggested lifetime.

16/17th centuy, based on the book Sepentum et Draconum Historie Libri Duo, which came out around 1640.

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Formerly DragonRider. Almost teenage me could have been more imaginative with names.

i think when the medivel knights hunted them in 1500-1700ad

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dragons are real get used to it or get lost...