Assertion: thunderbird | /r/HasProperty | pterodactyl
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Source sentences:
text: Some have theorized that the Thunderbird is a species of pterosaur, such as a pterodactyl, which has survived the prehistoric age, while others suggest it could be a type of condor or oversized vulture.
text: A small section of pseudoscientists believes that the Thunderbird could have been a pterodactyl that managed to survive longer than thought possible or another form of megafauna.