The unusual, robust nature of this bone led Olson and Steadman to believe that Xenicibis was flightless that had evolved on Jamacia.
不寻常的是,这块天然形成的强壮骨骼使得Olson和Steadman相信始祖鸟是很少飞行的,而这恰是Jamacia地区得以进化的原因。
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