User blog comment:BannedLagiacrus/Monster Appreciation Week: Molten Tigrex/@comment-4702773-20160124053148/@comment-17735225-20160124144822

@dracosaurian I can't see where you are coming from though. Bird's respiratory system functions to keep the air in its body all the time to support flying, and I don't see anything related to benefiting from more oxygen in that. They still only have typical functional lungs.