From the Super Mario Wiki, the Mario encyclopedia
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The Pterodactyl is a creature that appears in the PC version of Mario's Time Machine. It appears if Mario enters an incorrect time or date into the Timulator, in which case he ends up in the Cretaceous Period. As soon as he arrives, the Pterodactyl begins launching eggs at him, and the only way for Mario to return to the present time is if he catches enough of them in a basket. The number of eggs that he needs to catch depends on the difficulty that the game is set at. Bullet Bills also attack Mario while he is catching them. After Mario catches enough eggs, he hops onto Yoshi's back and runs back to the present.