So, the most common cause of respiratory illness in birds is aspergillosis...it's a fungal infection that's common in pet birds (humans can get it too, but not nearly as much).
It causes lesions in the bird's air sacs, a part of the respiratory system we don't have. Sometimes, if it's severe, the infection can spread into the bone.
This appears to have happened to an unfortunate...dinosaur. The fossil of a young sauropod shows damage that might indicate a severe...and possibly fatal...case of the disease.
Poor dinosaur. Chickens, remember, are still dinosaurs...
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