CRYPTOZOOLOGY is the study of animals not yet proven to exist, but at one time did exist, or are currently part of lore. Some of the biggest cryptozoology debates (bigfoot, the Loch Ness Monster, the Chupacabra) have given the field a bad name in the scientific community. On the other hand, there are many animals we know of today that were once only legend. (For more, see Wikipedia's article on cryptozoology.
This looks fake, and I only include it because it looks cool. (Plus, I like the idea of naming it. A Zebalope, maybe?)
This definitely real, pulled up by a Japanese fishing boat, and somehow preserved for who knows how long. It's definitley from the age of dinosaurs, and it would have been so awesome if they'd brought it back with them for study, but of course a fishing boat is out there to make money, and to do that they fill every available space with fish, so there was no room. (If they'd only thought it through, they could have made so much more money with the Loch-Ness animal!)
And I have no idea if this is real or not. You'd assume not, but this museum is in transylvania, and it wouldn't shock me at all 'twere it true.