Identifying

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Hello. I have recently went to a pet store and bought 2 fire-bellied toads. I had asked the store I bought the toads from if one was a male and one was a female but they weren't sure at the time. So I was wondering if anyone has had or have fire-bellied toads and knew how to identify if one is female and one is male? It would be much appreciated since I have no clue if I have a females or males, or one of each. Thanks!