Có phải rùa nào cũng có mai?
Trong khi hầu hết các con rùa đều có một vỏ mai cứng ở trên lưng, thì loài rùa luýt chỉ có lớp xương bảo vệ nằm dưới da và thịt. Vì vậy mà tên chúng có nghĩa là rùa lưng da.
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