I love seeing upgrades that change things visually. The wings are especially cool for the zerglings, since it stresses their whole evolution theme.
God help us in Starcraft 3 when zerglings can fly...
Not to be a science geek or anything, but wings on a creature wouldnt make it run faster. That only applies to aerodynamics (things that fly in the air without surface friction). Having wings on zerglings cannot possibly make their legs muscle stronger or move faster. A realistic aesthetic for speedlings would be like beefier legs or longer legs. Just my two cents.
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