Goldfish can see more colors than we can. Human eyes can see only three primary colors: red, blue and green. All other colors are mixtures of these. A goldfish, however, can see four, making it a tetrachromate. – WTF Fun Facts
WTF Fun Fact – Goldfish See More Colors
how would one know she is a tetrachomate?
Yellow is a primary color, green is a secondary color. However, we have a receptor for green, not yellow.
Besides, the three receptors humans have are for red, blue and green – not yellow.
I don’t know about you, but i can see more than 3 colors. The numbers of receptors doesn’t indicate the number of colors one can see…