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In that they are actually modifying/adding new genes. I've seen it, too, where they inject genes from a certain jellyfish into other fish to make them glow.
"The bird is not genetically modified - it comes from a natural breed whose characteristics have been known for 50 years. Read more at NewScientist."
IMHO, I agree with rodriguez, it looks cool. And can't be any worse than having a Japanese bantam with extremely short legs or breeds with extremely large crests. Both those characteristics can impair a chicken.