REVUE SUISSE DE ZOOLOGIE 

 Tome 76, n° 4 — mars 1969 



57 



On the Behaviour of the Amazon Dolphin, 

 Ma geoffrensis in Beni (Bolivia) 



by 



G. PILLERI 



Brain Anatomy Institute 

 Waldau-Bern Switzerland 



With 34 figures 



CONTENTS 



Introduction 58 



Biotop 59 



Behaviour protocol 59 



Body measurements 64 



Food 64 



Observations made on animais in captivity 66 



Discussion 



a) Ranges 67 



b) Enemies 68 



c) Swimming, blowing, diving and leaping 69 



d) Tumbling in shallow water 69 



e ) Resting on the bottom of the pool 70 



f) Play behaviour 71 



g) Flight behaviour 71 



h) Epimeletic behaviour 71 



Summary 72 



Zusammenfassung 72 



Résumé 73 



Literature 74 



