To emit a full, clear sound bats have faces like dried leaves with stud structures on them. Because each has its own kind of food and to keep a distance from other kinds of bat, each is incompatible with all others.
比如用來矯正聲音，形狀如枯葉、釘矛的構造，由於捕食對象不同，和為了分辨不同距離，又有各種不同組合。