how can you tell

Question
how can you tell if a African dwarf frog is a boy or a girl i got two of them and i want to know for sure.

Answer
Colton,                                                      It is kinda hard to tell the difference between them unless you have a community of them. The females are larger about 1.25" to the males 1". Though the males arms turn black when they are ready to breed. The male also have black pads on their fingers for grasping the female. Good Luck, Tina