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It's not that they can't. They just don't need to, says Mike Murray, a veterinarian at the Monterey Bay Aquarium in California. Birds have the anatomical and physical ability to pass gas, he explains, "but if I saw gas in a bird's gastrointestinal tract on an x-ray, I'd suspect that something abnormal was going on in there."

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5YBaR TIL The trivia (singular trivium) are three lower Artes Liberales: grammar, logic, and rhetoric. These were the topics of basic education, foundational to the quadrivia of higher education, and hence the material of basic education and an important building block for all undergraduates.
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