Telling if your yellow bellied turtle is a male or female can be fairly easy if it is already an adult. Adult females are significantly larger than males. There are other things to check which include the length of their claws. Males claws are much longer than females as they tickle the female during mating with them. Tails are another thing to check as the female will have a short stubby tail with the opening closer to the shell than a male. Another tell tale is the plastron. Males will have a concave plastron (meaning it goes inward or dips into the body) whereas females will have smooth plastron. For more on figuring out your turtles gender look at our in depth guide.