The alien parasite mimics the DNA of its host to attain beneficial traits to its environment. While this is sci-fi, the human parasite (I mean to say we human beings) tend to develop traits of the animals they eat. Those who eat a lot of beef, get... beefy. Pork eaters tend to turn into gelatinous blobs and even have piggy little noses. Poultry eaters are jittery little fuckers. And poultry eaters on meth are highly dangerous. Perhaps you should stay away from cock-fights. But it really is goddamned fun to get wasted on cheap rum and watch a couple of roosters gore each other while grown men wave money around making crazy hand symbols like the NYSE back in the day down on the floor... before everything went digital and synthetic. Hmmm.... that's a funny looking haiku.