The gradual evolutionary change – from fast-running, ground-dwelling, bipedal theropods to small, winged, flying birds – probably started about 160 million years ago. It was possibly due to a move by ...
The gradual evolutionary change – from fast-running, ground-dwelling, bipedal theropods to small, winged, flying birds – probably started about 160 million years ago. It was possibly due to a move by ...
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