Kapitel 3: Individuelles Kennenlernen, Verhalten und Intelligenz

Introduction

S
ystematical sonographical studies on cranes had rarely been conducted in previous years, first by Archibald [1]. His goal and achievement was a taxonomical assessment by similarities and dissimilarities of the unison call as displayed by the various species of the cranes all over the world. No hints were given if any individual characteristics were detectable.

A second study [2] on the sandhill crane (grus canadiensis) was performed in order to evaluate individual and regional similarities and differences of their voice. Due to the use of the "guard calls" [3] and rather insensitive sonographical techniques (electromechanical, as available at that time), not only the recording method (a significant disturbance) was inappropriate for our goals, also the manual evaluation technique of the analogous sonograms is not effective. Moreover, the guard call was mostly expressed by the single crane in absence of its mate, so that pairs can not be identified, and hence the results of the study questionable. The unison call was not analysed by Weekly due to its complexity not manageable by this sonographical technique.

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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