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鲨鱼身上的感知器官让它们能在数公里外就能闻到血的腥味，不过鲨鱼是不是也对人的血这么敏感呢？

美国Youtuber马克罗伯日前上传一段影片，他们来到巴哈马海域，测试什么样的液体能够吸引鲨鱼。实验团队甚至当场“抽血”，以人血做实验观察鲨鱼反应。

实验团队用仪器分别将海水、尿液、鱼油和牛血，以固定频率注射至海水中，并放在冲浪板上，观查究竟哪一块冲浪板会有最多鲨鱼聚集。

实验结果发现，尿液就跟海水一样对鲨鱼毫无吸引力，鱼油也好不到哪去，实验过程中仅4只鲨鱼被吸引。而载著牛血的冲浪板在一个小时中，总共有41只鲨鱼前来造访。实验团队更进阶，第二阶段直接抽人血做实验，测试多少血量浓度比较容易吸引鲨鱼。

但实验结果却大爆冷门，不论是慢速或快速将人血注入水中，效果都大不如牛血，一个小时当中竟没有任何一只鲨鱼前去造访。马克总结原因可能是因为第二次实验的血液浓度远小于第一阶段时的牛血（人体不可能大量失血后还活着），所以一般人在外不小心滴了一滴血在海中，也不用过度惊慌。