Females of the túngara frog (Physalaemus coloradorum) prefer calls by males that have had "chucks" artificially added to them over the normal male calls of their own species. The chucks are a normal part of the male calls of another closely related frog species (P. pustulosus), in which females prefer males that produce low frequency chucks. This suggests that the female preference for chuck calls

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The preference of female túngara frogs for calls with artificially added chucks, despite these not being a natural part of their own species' calls, suggests that this preference exploits an existing sensory bias. This bias may have predated the evolution of chuck calls in the closely related species, indicating that the preference for such calls was not specifically developed for them but rather tapped into a pre-existing sensory preference.

Females of the Túngara Frog (Physalaemus Coloradorum) Prefer Calls by Males