sometimes weathering milk / building mammals
mammals has breasts cow is hoofed_mammal. cow is not hoofed_mammal. mammals has not warm_blood goats is not sure_footed_hoofed_mammals. pigs is hoofed_mammals_oink. goats is sure_footed_hoofed_mammals. pigs is not hoofed_mammals_oink. mammals has warm_blood mammals has fur