Why we think that some extinct giant flying reptiles cared for their young But how do we do this for extinct animals? In a recent scientific paper,palaeontologist Zixiao Yang and colleagues compared the growth of small and giant pterosaurs. These were flying reptiles that were alive between about 228 million years ago and 66 million years ago – sharing the Earth with dinosaurs. Yang and colleagues wanted to understand what, if anything, was different about how the giant animals got so big.
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