Dangers of the southern seas. Stingrays
This article discusses the biological hazards warm southern seas. The main danger in these places are cartilaginous fish - mostly marine animals, including the inhabitants of the deep water.Representatives of this group have a cartilaginous fish tail needle. Sami needles are flattened laterally and covered on the sides rough notches. On the bottom surface of the groove of the needle passes, on which the cells that produce poisonous secret