Along with mortality rate, natality rate is used to calculate the dynamics of a population. Animal natality is expressed as an age-specific schedule of births. According to Mussolini, only through promoting natality and eugenics could this be reversed. Specific birth rate is used when calculating animal natality. This investigation was conducted through observing data from the Natality Files from 1975. As the average adult ages of both female and male increased, the natality rate decreased. Calculating and concluding the natality rate of humans is similar to animals. Plant natality is an uncertain factor to measure. Another term used interchangeably with "birth rate" is "natality". Natality in population ecology is the scientific term for birth rate. Natality is shown as a crude birth rate or specific birth rate. In Eastern Europe and Russia, natality fell abruptly after the dissolution of the Soviet Union. The natality rate has been falling steadily and the village has rapidly declined in population.