Bioacoustic methods in ornithology help to solve a wide range of problems, for example the distinction between similar species of birds or bird species with quite similar voices, for remote monitoring of populations etc. The sonograms of Thrush nightingale (Luscinia luscinia) and Common nightingale (Luscinia megarhynchos) singing help to distinguish these two species by voice definitely.
<a href="//commons.wikimedia.org/wiki/User:Yu_Moskalenko" title="User:Yu Moskalenko">Yu Moskalenko</a>
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<span class="int-own-work" lang="en">Own work</span>