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Hollow bones that let dinosaurs become giants evolved at least three times independently, shows stu (from http://www.bing.com/news/apiclick.aspx?ref=FexRss&aid=&tid=640940e5bb104d9ba9db82f34ffe5ea0&url=https%3a%2f%2fphys.org%2fnews%2f2023-03-hollow-bones-dinosaurs-giants-evolved.html&c=4619564083759147350&mkt=en-us)
Dinosaurs as big as buses or five-story buildings would not be possible if their bones were dense and heavy like ours. Like present-day birds, dinosaurs had hollow bones with inner structures known as ...