The predator-prey equations is a system of two linked equations that models two species that depend on each other: One is the prey, which provides food for the other, the predator. Both prey and predator populations grow if conditions are right. Alfred J. Lotka found these equations in 1925. Vito Volterra found them, independently, in 1926. For this reason, the equations are also called Lotka-Volterra equations.