【英语时差8,16】乌贼-伪装大师（下）

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They also put cuttlefish¹ in tanks with a range of different checkerboard patterns to see how well they could differentiate² between different colors or brightness. When in front of a high-contrast background, like alternating dark and light squares, the cuttlefish skillfully mimicked³ the checkered⁴ pattern. They also tried checkerboards of different colors that were very similar in brightness. That is, colors that would look the same shade of grey in a black and white photo. In front of these low-contrast checkerboards, the cuttlefish just turned a single solid color. So it seems that cuttlefish camouflage⁵ themselves by matching light intensities⁶ of objects rather than their colors. But how they match colors so accurately⁷ is still a mystery.

 

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