Although previous studies have indicated that male displays promote ovulation in the female ring dove, it was unknown whether perception of the male's structural features was an essential prerequisite for the response. In the present study, females were exposed to the shadow of a courting male or to his vocalization alone. Vocalization itself was ineffective in inducing ovulation, but half of the females provided with the additional visual stimulus laid eggs. It is suggested that perception of the feather and color patterns of the male are not essential conditions for the female's response.
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