1. Look at the abdomen of the mask-necked turtle: there will be a straight line in the middle of the abdomen. Male tortoises with masks are generally concave, while females of mask-necked turtles are generally flat.

2. Look at the tail: male tortoise with mask has a longer tail , the mask side-necked female turtle is relatively short.

3. Body size: The female tortoise with the mask is round, thick and large, and the male tortoise with the mask is thinner and smaller.