A stirk, is that something like an AD&D stirge*?

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*These birdies were Cursed Children of the Typo, anyway. The originals - Latin 'strix', plural 'striges' - were blood-sucking, owl-like nocturnal birds. But, hey, who cares about typos when a game has a Rust Monster shaped like that odd critter usually contained in a bag of cheap plastic dinosaurs?