Quote Originally Posted by tgampper View Post
FBTs mature in about a year. Up until that time, it will be difficult to tell what sex they are. Generally, females are larger and more rotund than males. Sexually mature males will call, have spiny dorsal skin (female skin will be much smoother), and thicker forelimbs. The toe webbing on the males will extend to the color tip of the toes, while the female webbing does not extend to the tip of the toes. Males will have dark (black) nuptial pads on the forelimb fingers. These pads are rough, horny skin that helps the male grab on to the female during amplexus (mating embrace). To be absolutely sure that you have a male, check these secondary sexual characteristics: call and nuptial pads. These frogs are very primitive and engage in inguinal amplexus, which means that the male will wrap his forelegs ("arms") around the females waist or lumbar area.
One is calling for sure, I think two others are females, and I'm not sure about the last

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