Prey- Predator model with two time delay

In this paper a prey-predator model with two time delay based on Lotka-Volterra system of differential equation is هntroduced. In this model the number of prey at time $t$ depends on the prey quantity in time $t$ and $t- \tau_1$, where $\tau_1$ is prey during pregnancy. Also, the predator quantity at time $t$ depends on the number of predator at time $t$ and the number of prey at time $t$ and $t- \tau_2$, where $\tau_2$ is predator during pregnancy. As follows, stability at equilibrium points are investigated.