This is an app that allows users to simulate the reproduction and death process of animal populations. Users can enter a series of parameters, such as the initial population size, birth rate, mortality rate, habitat space, etc. The app simulates the changes of animal populations in a specific period of time based on these parameters. Through graphical display and animation effects, users can intuitively see the growth, decrease and dynamic changes of the population. In addition, you can draw in the app and learn about animals. It is very suitable for children in their learning period.