Cockroach workers are found in the Stronghold of Player Safety. They are good non-member monsters for mid-levelled players to train on. They also drop Crimson charms quite often, making the Stronghold a popular place to obtain charms for training Summoning. Many players take free food from the nearby fishing spot when training on cockroaches. Also the Monastery is nearby for healing or using the altar (level 31 prayer needed).