Researchers show high-performance breathing in bones
(PHYSorg.com Archaeology & Fossils)

Dinosaurs are far from extinct, but dominate as birds still most regions of the globe. Part of this huge success is due to the evolution of air sacs, which are crucial for the high efficiency of their respiratory system. Scientists at the University of Bonn analyzed the structure of bones that are in contact with air sacs and found both in extinct and extant species a hitherto unknown type of bony tissue. The results now are published in Biology Letters.