File:Are dogs red–green colour blind?.pdf
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![File:Are dogs red–green colour blind?.pdf](https://upload.wikimedia.org/wikipedia/commons/thumb/d/da/Are_dogs_red%E2%80%93green_colour_blind%3F.pdf/page1-413px-Are_dogs_red%E2%80%93green_colour_blind%3F.pdf.jpg?20240614131940)
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