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(Hyla chrysoscelis) - The success of reproduction is dependent on a female's ability to correctly identify and respond to the advertisement call of a potential mate. At a breeding site with high densities of males, the male's chorus may overlap with heterospecific calls, making it difficult for the female to successfully locate a mate. When the advertisement calls of the male gray treefrog and male Cope's gray treefrog overlap, female gray treefrogs make mistakes and choose the heterospecific call. The amount of errors the female makes is dependent

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