αν διαβασεις τα λινκς παραπανω .....
π.χ.
Rays are poisonous. They have at the end of their tails a venomous stinger. The rays shed this stinger every 3 to 6 months. If you come in contact with this stinger due to ignorance or accidentally, (or maybe both), go to the doctor or hospital immediately. You will require medical attention. The rays will never deliberately sting you as the stinger is used for self-defense. But when cleaning the tank always keep in mind the location of the rays for your own safety.
κεντρια με δηλητηριο ...πως σου φαινεται??