“…In population dynamics, the functional response refers to the number of prey eaten per predator per unit time as a function of prey density. Generally, the functional response can be classified into many different types, such as Holling I-IV types [10,11,16,19], Hassell-Varley type [9], Beddington-DeAngelis type [3,6], Crowley-Martin type [5], Leslie-Gower type [13] and so on, and have been proposed and investigated widely [2,7,15,18,20,21,25,31,32].…”