When was the last time you checked?
"In a literal "lucky break" that exposed unusual bone tissue lining the hollow cavity of a Tyrannosaurus rex leg bone, paleontologists at North Carolina State University have determined that a 68 million-year-old T. rex fossil from Montana is that of a young female, and that she was producing eggs when she died. ...-- National Science Foundation
... "The 107-centimetre-long femur - small for a T. rex - was intact when found, and its hollow interior had not been filled with minerals. That is unusual for a long-buried bone. ...-- New Scientist
ANATOMY-- EnchantedLearning.com
"Tyrannosaurus rex was a fierce predator that walked on two powerful legs. This meat-eater had a huge head with large, pointed, replaceable teeth and well-developed jaw muscles. It had tiny arms, each with two fingers. Each bird-like foot had three large toes, all equipped with claws (plus a little dewclaw on a tiny, vestigial fourth toe). T. rex had a slim, stiff, pointed tail that provided balance and allowed quick turns while running. T. rex's neck was short and muscular. Its body was solidly built but its bones were hollow.
"But estimating both the size and life span of a T. rex was thought to be impossible: the weight-bearing bones used to estimate size were hollow, like bird bones, and grew in a way that erased much of the growth record. ...-- Boston Globe
So, were dinosaur bones so similar to bird bones? It’s clear that these sources say that the bones were hollow, but only one source, the Boston Globe, uses the comparison to birds, and only when speaking about some of the bones.
Are we talking about bird-like hollowness, or man-like hollowness? Our bones are hollow, at least the long bones (and a couple others), and filled with marrow. But they’re not bird-like.
I’ve seen a lot of great Discovery and Science Channel shows about dinosaurs, and none of them compared the hollowness of dinosaur’s bones to birds bones.
Am I really missing such an interesting similarity? I’ve seen documentaries that compare dinos to birds, and never heard this claim before.