What would the science be behind a monster who can only see shades of red, black and white?

I have an idea for this crazy blood thirsty monster and the reason behind its love for killing is red is the only color it sees, but I don't know how or if that is possible a logical scientific explanation would we nice. I haven't seen any data on creatures who see in black and white plus another shade of color. Please help, and thank you!

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What would the science be behind a monster who can only see shades of red, black and white?

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