Among extant vertebrates. pneumatization of postcranial bones is unique to birds. with few known exceptions in other groups. Through reduction in bone mass. https://foldlyers.shop/product-category/sma-cables/
Vertebral Pneumaticity in the Ornithomimosaur Archaeornithomimus (Dinosauria: Theropoda) Revealed by Computed Tomography Imaging and Reappraisal of Axial Pneumaticity in Ornithomimosauria.
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