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Birds' Hollow Bones
Some Birds had solid bones and some birds had hollow bones.
The Birds that had hollow bones could fly, but the birds with solid bones could only walk.
The birds that could fly escaped from prey and could build nests in trees while the birds who couldn't fly could not. The birds with solid bones ended up dying because they couldn't make nests or escape prey. Only the hollow boned birds lived long enough to produce offspring.
Eventually all of the solid boned birds died and only a population of hollow boned birds lived. The hollow boned birds reproduced and they were the only variation of birds.
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