Hoan Kiem turtle has great spiritual significance in Vietnamese culture, was regarded as a legend gods from the famous Hoan Kiem Lake XV century, and people are often called the "tortoise". The appearance of the Hoan Kiem turtle always attracted the attention of many people; Hanoi especially when people believe that seeing Turtles will experience good points. Besides, due to the Hoan Kiem lake water level is quite low, no sandy beaches, plus the environmental factors of water should have no small threat to the life of turtles. The study of individual turtles were difficult also.
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