Ukuba kuyenzeka itshintshe indawo yazo, ayisayikuzilungela izilwamyana nezityalo ukuba ziphile apho. Ngenxa yokokuba kaloku izilwanyana nezityalo zingayiqhelanga loo ndawo intsha lube nonxulumano phakathi kwazo nale ndawo intsha luluncinane, oku kungabanga amakhwiniba ngamakhwiniba. Ukuguquka kwemozulu ikwenza okokuba ezinye iindawo ezihlala kuyo izilwanyana neentaka zibeshushu,noko kunezo ziziqhelileyo ibe ke iintlobo ntlobo ezininzi zezilwanyana zifudukela kwiindawo ezipholileyo. Nangona kunjalo, ezinye iintlobo zezilwanyana azikwazi ukufuduka zitsho ke ngoku zingandi ziye zincipha ngokuncipha. Ingcali zenzululwazi zicinga okokuba 10% yezi ntlobo ekhulwini zingahamba zihambe ziphele ngenxa yolu tshintsho. Ezinye iindawo zokuhlala izilwanyana nezokukhulela izityalo zilungiselelwe ukuba zihlale efama. Umzekelo ophilayo ngowase-Australia, ama-80% amahlathi e-eucalypt aagawulwa ukuze kwenziwe ifama kwiminyaka engaphaya kwa-210 eminyaka egqithileyo. Oku kungachaphazela ubukho bamahlathi ekuphila kuwo izilwanyana ezinje nge-koala.