A kind of animal that lives only on alcoholic beverages. With peculiar metabolisms they convert the alcohol and the various proteins from mixed drinks and wine and beers into everything they need. And they can change outwardly, like a chameleon or a rockfish, for protection. So they can live among us. And maybe, Coretti thought, they grow in stages. In the early stages seeming like humans, eating the food humans eat, sensing their difference only in a vague disquiet of being an outsider.