The animal that lives in herd grade of gregarious, from latin grex gregis, Flock, herd. This instinctive tendency to coexistence in group is typical of many animals in order to survive. Imagine a single bee or an Ant, they would not survive. In the case of human beings, already Aristotle said it, we have a natural tendency to live ( the man is a political animal, ) together but not scrambled, i.e., we also have a trend opposite to the insulation. When one does not know this occasional isolation & say no to certain behaviors of herd we qualify it contemptuously borrego, complacent, mackerel, emborregado, vulgar