1. The position and shape of the excretory hole can distinguish male and female: the position of the male freshwater carbon turtle is close to the tail, and the hole is elongated; the position of the female freshwater carbon turtle is close to the plastron, and the hole is round.

2. The thickness of the tail can distinguish male and female: male freshwater carbon turtle tail It is thicker, and the female freshwater turtle is thinner and shorter.

3. The male and female can be distinguished by whether the nails are concave: the male freshwater turtle has obvious depression, and the female freshwater turtle is flat.