Abstract
The ambient noise level in the environment of most species varies and consequently many animals that use acoustic signals are faced with a potential signal detection problem. A male Japanese quail emits separation crowing when separated from a female with which it has paired. These separation crows tend to be emitted in temporal groups or bouts. This study demonstrates that the ambient noise level affects the emission of separation crowing. The two related changes in emission of separation crowing found in this study were: (a) increasing the frequency of separation crowing; and (b) increasing the number of crows per bout. These related changes should help to increase the detectability of the signal and the localizability of the transmitter.
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