The quality level of animals and their populations is a result of their adaptation to their environment. This in turn is determined by the degree of adaptability to the data animals all interacting with living organisms. By increasing the level of quality animals are defined as any morphological changes in their hereditary traits (regardless of the direction of change in this their level of morphophysiological organization) to promote the preferential survival of the animals in the different conditions of existence (with a changed level of quality of their environment). That is the equality of levels quality of animals and their habitats is a qualitative agreement with each other biological systems. Each species of organisms in interaction with their environment is opposed to a series of changes in the environment, for survival form requires the acquisition of its special features a complex, offsetting all of these changes. It is very unlikely that a single genotype, even the most numerous species, by mutational variability can purchase at once all the necessary attributes. Much more likely that these traits are introduced into the gene pool of populations separately by individual genotypes, ie through the specialization of individuals in some changes in the environment, then in general population’s gene pool, in the process of generational change, is united by kombinativnoy variability, all of these traits in each genotype, ie, is the universalization of individuals. If this kind of animal continues to experience the action of natural selection – specialization and the universalization of individuals takes place at the same time.. .