Greasels are green mutants that spit poison. Raptor chickens. Really nasty if you meet one in a closed space like a ventilation duct. I can't really understand why anyone would want to create a creature like that, but then Deus Ex is filled with mad scientists who have too much free time on their hands. One even has one of those stereotypical accents. "Please! You'l upset ze subjekt!"
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