这种古老的爬行动物背上有着标志性的船帆状背鳍，它常常会被误认为是一种恐龙，甚至出现在恐龙玩具中。
This reptile, with its iconic sail-shaped back, is often mistakenly identified as a dinosaur, and is even included in packages of toy dinosaurs.
总之，对比爬行的孩子，能走的孩子要花费三倍的时间和妈妈互动，和两倍的时间玩具玩。
Overall, the walkers spent three times as much time interacting with their mothers, and twice as much time interacting with the toys, compared with crawlers of the same age.
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