Because the wolves have been repudiados by the cattle dealers, who argued that their yearling calves lost, cows, horses and donkeys by the attacks of these canine ones, in years 50 it condemned the extermination to them. At the beginning of 1990 some authors considered that as soon as they were left 10 wolves in freedom. At the present time the population of wolves only is of 260 wolves between the United States of North America and Mexico.