@article {53437,
	title = {Bird vocalizations: seven different types of Great tit (Parus major) vocalizations},
	number = {201811},
	year = {2018},
	abstract = {<p>The Great tit (Parus major) produces a large variety in calls and songs. Seven different types of vocalizations are described in this paper. Interesting is that those types differ in (acous- tic) structure. Three structures can be observed: 1) a vocalization can be \&$\#$39;tonal\&$\#$39;; a pure tone, usually in time varying in frequency (often a so-called \&$\#$39;upsweep\&$\#$39;); 2) a vocalization can be \&$\#$39;pulsed\&$\#$39;, a series of pulses consisting of a fundamental frequency on which the pulse repetition frequency is superimposed; the pulse repetition rate is between 210 and 240 pulses/s; 3) a vo- calization can be pulsed, however, with a \&lsquo;semi-broadband\&rsquo; spectrum. Great tit vocalizations are concentrated around two frequency ranges: around 4 kHz and around 8 kHz. The duration of vocalization components is rather limited, usually between 95 and 130 ms.</p>
},
	url = {https://www.researchgate.net/profile/Willem_Verboom2/publication/329390530_Bird_vocalizations_seven_different_types_of_Great_tit_Parus_major_vocalizations/links/5c1618f34585157ac1c5cbaa/Bird-vocalizations-seven-different-types-of-Great-tit-Parus-major-voc},
	author = {Willem C. Verboom}
}
