舉起腳來看一看，
你的小腳趾是2個指節？還是3個？
看看朋友和自己的耳朵，
誰有「達爾文結節」？誰又有鰓殘存的演化痕跡？
來自「彈跳耳」星球的外星人來到了地球，
他們發現：
地球人的雙手指節數目基本上都相同，但唯獨小腳趾，有人是2節、有人卻是3節！
某些人的耳輪有著跟猿猴一樣的「結節」，難道這就是傳說中的演化痕跡？
地球上的動物只有極少數擁有指紋，但無尾熊的指紋居然跟人類一模一樣，相似到連用顯微鏡都分辨不出來！
像這種連大人都未必知道的人體小知識，
以外星人的眼光來看，
顯得格外有趣。
小孩們可以一邊閱讀、一邊觀察自己的身體構造，
全書用字簡潔，圖片可愛，
中年級以上的孩子，很容易就能一頁頁讀下去！
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