16 what kind of tortoise is a tortoise?

16 tortoise shells are turtles. There are 13 pieces on the tortoise shell. The tortoise's carapace is divided into five middle carapace and four left and right carapace, and the left and right carapace are symmetrical. However, some turtles are born with abnormal or damaged armor shields, which seems to increase the number of armor shields, and some have 16 pieces, which are called tortoises. However, many merchants in commercial speculation now carry turtles with improper armour, thinking that they are very rare and precious things. In fact, due to inbreeding and improper feeding of a large number of tortoises, as well as man-made malicious injuries, there are quite a lot of tortoises in the market.