Some research suggests that the lack of milkweed, monach butterflies main source of food, is to blame.
Bangwe ba re lebaka la konokono ke go tlhaela ga diphologolo tse di di jang, e leng mebutla, e bontsi jwa yone e bolailweng ke bolwetse jwa myxomatosis (bolwetse jo bo tlhaselang mebutla).