In the second phase, additional sensors are selected, called connectors.
On the software plugins also, the bright channel was selected (called "Brilliant" on the ReValver AC30), all tone controls were set to 12 o'clock, and different recordings were made while varying the channel gain.
Select "Call with Google Voice" from the options that appear when you press the call button.
Using a sub-sample of 23 nestlings for which we randomly selected calls we confirmed that our call selection lead to similar estimation of call parameters (see additional file 4).
Models of honest advertisement predict that sexually selected calls should signal male quality.
The acoustic structure of sexually selected calls often contains information on different phenotypic traits of the caller that is potentially available to other individuals [4], [16], [24], [43].
In addition to male body size, sexually selected calls might convey information about other indirect measures of male fitness, such as social dominance.
Males only vocalise during the breeding season and the sexually selected call they produce is known as a groan [32], [33].
Groans are sexually selected calls mainly produced by mature males (≥ four years old).
