Press the flag button to start, if the prey dies immediatly, press it again. <#>-<#>-<#>-<#>-<#>-<#>-<#>-<#>-<#>-<#>-<#>-<#> It is just a simulation, and no simulation is the same, so you can watch it forever. Although one of the two populations could die. If that happens press the flag to start again.