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B. maxima can be sexed by looking at the webbing between the toes. The male of the species will have webbing that is more pronounced and completely spans the distance between the toes in an almost straight line. In females the webbing is less pronounced and arches in between the toes.
Sexing B. orientalis is more of a challenge, as the method for sexing B. maxima is not reliable since the webbing in both genders is similar. The genders are very difficult to distinguish outside of the breeding season. You may not be able to identify a female out of breeding season, but there are two methods to identify adult males. The first is the call, which sounds like a soft moan or the muffled barking of a dog, and the other is his general behavior, because most males will regularly engage their fellow terrarium residents in amplexus (the mating embrace). Without the proper conditioning of both genders, which involves a cooling period, nothing will come of this behavior.