How to Determine Sex in Aldabra's
Both these animals are 29 inches longways straight across the bottom. The male is on the left the female on the right.
Though it is harder to see in this pic, from this angle the male starting to become concave on the bottom.
Also note the males tale is longer 9 1/2 inches compared to the females which is only 6 1/2 inches long.
Surprising both tails are 2 1/2 inches wide, which must mean proportionally the females tail is shorter and fatter.