There are differences between the sexes in regards to the color of their underbellies. Males usually have a yellow or orange belly and throat, while females are more creamy beige underneath. Juveniles may have dorsal stripes down their backs and females are more likely to keep this stripe into adulthood rather than males.
Males can grow up to about 20-25cm (8-10 inches), while females are smaller and can reach about 11- 15cm (4-6 inches).
The easiest way to determine the sex of your African Bull Frog is by listening, as males will call during the mating season. They will also develop broader heads than the female, have yellow or orange chests and grow to a larger size.