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For the life of me I can't remember the term, but this does exist. Basically genes can be linked together and as one gets selected, it brings along the other, non-related gene (and it's traits).

If I can think of the term and some examples I'll edit. Hopefully a fellow HNer with a better memory can help me out.

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Are you looking for vestigial? I would be inclined to agree with you, except that birds have tetrachromatic vision (as opposed to our trichromatic vision), and it is possible that the beak coloration is visible after all.

i think it’s genetic drift

I think you're right, but after learning about the birds' fourth photopigment, I think this is probably regular evolution at work and there is some selective advantage to it since they can (probably) see the colors in some capacity.

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