Now,the milkmaid ants are different.They collect sap for other ants and themselves!They get the sap from the sap-lice.The sap lice drink sap and the extra sap collects in a tube on their backs.The ants drink this sap because that's what they eat, and they can't get it by themselves.And,by the way,they are not stealing.The sap-lice don't need the extra sap.