Ibishyimbo byinshi bidafunzwe, bikunze kuboneka mu nganda z’ubuhinzi n’ibiribwa, ni ikintu cyingenzi kizana inyungu zubuzima no kwishimisha kumeza. Ibishyimbo, biracyari bikubiye mubikonoshwa byabo, bahabwa agaciro cyane kubintu byinshi byimirire hamwe nuburyo butandukanye mubiryo bitandukanye. Kimwe mubyiza byingenzi byibishyimbo byinshi bidafunzwe ni imirire yabyo