[Ernest_at_the_Beach]

These guys would qualify as dragons....so maybe there was mankind around to actually see them....Greeks seem to have known about dragons....

[SunkenCiv]

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The First Fossil Hunters by Adrienne Mayor foreword by Peter Dodson

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[colorado tanker]

Yikes, you’d have a lot worse than sharks to worry about with those things around.

[Ramius]

These guys would qualify as dragons....

Whether there were people around to see them or not, there were certainly bones and skulls to be found that would suggest that such creatures as dragons indeed did exist. People that found them would not necessarily assume that bones came from ~extinct~ species, but naturally might presume that living examples must exist somewhere.