Kapitel 3: Individuelles Kennenlernen, Verhalten und Intelligenz

The authors were recording birds whose territories were certainly too distant from each other to have birds changing locations. They showed, that an individual identification should in principle be possible, but did not perform it in a given region with several neighbouring territories, nor over several years.

In a more recent work (published after the development of the technique described here), C. Walcott [7] et al. used a commercially available program for analysing bird calls based on "Canary 1.2" and a multivariate factor analysis running on Macintosh and applied it on banded common loons. They were mainly able to recognise the loons and to follow them when they changed their territory, however, the program also produced some uncertainties [8] due to its concept (it automatically looks for empirically determined characteristic frequencies of the introduction, of lengths of tacts, etc., but would not be able to analyse unison calls where two birds are calling simultaneously).

The method

I
developed a lightweight system consisting of a transportable minidisk recorder, fed by a long range microphone (Sennheiser 486) with highest sensitivity and resolution plus an intermediate amplifier ("booster"), digital filing on minidisk and analysis by two different computer based Fast Fourier Transformation analyses.

Ein Teil des notwendigen Equipments
Ein Teil des notwendigen Equipments

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Hauptmenue | Vorwort | Kap 1: Bild und Ton | Kap 2: Kranicharten | Kap 3: Kennenlernen, Verhalten und Intelligenz
Kap 4: Graue Kraniche | Kap 5: Mandschurenkraniche | Kap 6: Schreikraniche | Kap 7: Resumés | Kap 8: Anhang