66 



G. PILLERI 



those found in the stomach of animal No. 417 (fig. 30). Krumbiegel (1954-55) 

 maintains that the Amazon dolphin feeds on crabs alone, Layne (1958) that the 

 dolphins eat fish, but I am of the opinion that, according to the stomach contents 

 of the animais caught during the expédition, the Amazon dolphin feeds on fish 

 and crabs. It is interesting to note that dolphin No. 418 had a well advanced dental 

 caries. Dental decay by Inia, also in animais caught in other régions of the Amazon, 

 seems to be common (Ness 1966, from material in the British Muséum and Layne 

 and Caldwell 1967). The reasons for this decay are not known. 



IIIIIIIIIMIIIIIi 



! III I II 



cm 



Fig. 3. 



Crab (species ?) found in the stomach of Inia No. 417. 



Observations made on animals in captivity 

 Marineland of the Pacific, Los Angeles, California. 



There are three Inias as well as other Denticeti in the Marineland. They are 

 kept in a round open air pool, approximately 5 meters in diameter. There is a 

 cavity on one side of the pool and the parapet here is slightly higher providing 

 shade for the animals. The Inias (fig. 19-27) are médium sized and piebald, pale 

 grey. During the day, they are very active. They spout in the same way as the wild 

 animals although much more frequently. One pattern of behaviour seen by the 

 animals in captivity which was not seen in Beni, probably because of turbid 

 water, was the swimming in a vertical circle. Quite often the animals lay motionless 

 for several seconds on the bottom of the pool. Thèse could be short sleeps. Ail 

 three Inias were caught in Peru (Iquitos). 



