問題 · 2026-05-30
並非所有動物都是色盲。大多數動物的色彩視覺與人類不同,但許多動物能看到人類看不到的光譜。
動物的色彩視覺能力差異極大,取決於其視網膜中感光細胞的種類與數量。許多哺乳動物如狗和貓擁有兩種感光細胞,常被描述為紅綠色盲,只能分辨藍色和黃色,但這並非完全色盲,而是色域較窄[1][2]。相反地,許多鳥類、爬蟲類和魚類擁有四種感光細胞,不僅能看見人類所見的顏色,還能看見紫外線[2]。最極端的例子是蟬形齒指蝦蛄,擁有十二至十六種感光細胞,能感知極其複雜的光譜。另一方面,深海生物或穴居動物因生活在極度昏暗的環境中,演化上更注重光線敏感度而非色彩辨識,視覺可能接近全色盲。總體而言,動物界擁有從全色盲到超強色彩視覺的完整光譜,每種生物的視覺系統都是為了適應其生存環境而演化的結果。
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