Stella is a visual programming language for system dynamics modeling that allows users to create graphical representations of systems using basic building blocks. The document demonstrates how Stella can be used to model predator-prey relationships by manipulating parameters like the number of owls and rats. While developing quality simulations requires resources and expertise, Stella promotes critical thinking skills and helps students appreciate environmental management. It is a useful tool for biologists to predict outcomes from environmental changes and benefits biology education when utilized properly.