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How Do Frogs Change Color to Match Their Surroundings?
青蛙如何改变体色来匹配周围环境？
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Frogs have special skin cells called chromatophores.青蛙皮肤中有特殊的色素细胞，称为色素细胞。
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These cells contain pigments that can expand or shrink slowly.这些细胞含有可缓慢扩张或收缩的色素。
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Light sensors in their eyes and skin detect background color.眼睛和皮肤中的感光器能探测背景颜色。
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Nerve signals then tell pigment cells to adjust their spread.神经信号随后指示色素细胞调整其扩散程度。
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This helps frogs hide from birds and snakes very well.这使青蛙能极好地躲避鸟类和蛇类。
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Color change is not instant—it takes minutes or hours.变色并非即时发生，通常需要数分钟甚至数小时。
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Some frogs change only slightly; others shift dramatically.有些青蛙仅轻微变色，而另一些则变化显著。
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It’s a natural camouflage system powered by biology and light.这是一种由生物学机制与光线共同驱动的天然伪装系统。