Crickets naturally gravitate to dark places. The two dark cylinders provide an ideal hiding place for the crickets, while also allowing for easy closing when feeding animals. Simply slide the cylinder out of the keeper and drop the flapper down to prevent escapees. If needed, cover the cylinder opening with one hand while moving to the animal that you are feeding. Remove your hand and lightly tap on the cylinder to release the appropriate number of crickets for feeding. Cover opening and return to keeper.