Pterodactyl/ˌterəˈdæktɪl/ Definition 1 of 1Pro Tip 1/3Not Birds Remember, pterodactyls are often confused with birds, but they're actually reptiles. Pterodactyls, unlike birds, couldn't fold their wings. Pro Tip 2/3Extinct Creature Pterodactyls no longer exist; refer to them as ancient or prehistoric. The pterodactyl used to soar the prehistoric skies, long before humans. Pro Tip 3/3Cultural Symbol Pterodactyls can symbolize something old-fashioned or outdated. That software is a pterodactyl; it's time to use something more modern.