- colour

humans have 3 photoreceptors (the things that allow us to see colour) one red one blue and one green but blue bottle butterflies have 15 photoreceptors, humans can see 7 million colours, which means there’s over 28 million colours humans can’t see
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𝑺𝒍𝒚𝒕𝒉𝒆𝒓𝒊𝒏 𝑷𝒔𝒚𝒄𝒉𝒐𝒍𝒐𝒈𝒚