会尝味道的触手
Octopus suckers contain special receptors that let an arm taste whatever it touches, even in total darkness.
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Keep it on your phone →伸手去摸一样东西,你感觉到的是它的形状和质地。章鱼伸出触手做的事更奇怪:它一碰就尝到了味道,靠的是每条触手上排列的几百个吸盘。
科学家最近发现,章鱼的吸盘里有一种别的动物身上都没有的特殊受体,专门用来感知不溶于水的化学物质。这让章鱼可以把一条触手伸进礁石里黑漆漆的缝隙,立刻知道那里藏着什么:食物、危险,还是什么都没有,不必先看见它,也不必把它拽出来。
这是一种完全不同的感知世界的方式,触觉和味觉合成一种感官,分布在八条各自独立的触手上。对一只在全黑中捕猎的章鱼来说,这样的组合也许比眼睛有用得多。
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