Translate into a formula using quantifiers

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Let B(x) be “x is a bird”, F(x) be “x has feathers”, and Y(x) be “x can fly”. Then translate into a formula using quantifiers: Some things that can fly are not birds.

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What you are trying to say, is that there exists some thing that flies and is not a bird. Using quantifiers this is $\exists x ( Y(x)\land\neg B(x)) $.