What happened with Archaeopteryx?
10,000 Birds
AUGUST 18, 2011
The hollowed-out bones connected to the lungs for respiration that we see today as a key bird adaptation to the aerobically challenging behavior of flight existed in many dinosaurs that were as far way from being bird-like as, well, as a T-rex is from being your pet parrot. Horses have six upper and lower on each side.
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