INTELLIGENCE, POWER, 



Since the rapidly growing vegetation of the swamp is 

 made up largely of water, the energy value of the food of 

 the hippopotamus per mass of intake is low. The hippo- 

 potamus must, therefore, take in a vast quantity of fodder 

 to produce enough energy for growth, reoroduction, and 

 the securing of food. 



Since the hippopotamus must provide for an enormous 

 storage space for rough food and since he must be stream- 

 lined in order to maneuver sufficiently through the mud to 

 secure his food, he would have to be such an animal as, 

 figuratively speaking, lives in a houseboat, propelled by its 

 own motor. 



Having no important competitors among the grass eaters 

 to share his vegetarian diet and having no carnivorous 

 enemies to attack him for his flesh, the hippopotamus fights 

 only his own kind. Therefore, this self-building, self-repair- 

 ing houseboat requires only a limited number of signals or 

 lookouts to guide him. 



We should expect that the brain of the hippopotamus 

 would be simpler in pattern than that of the giraffe. As in 

 other marsh animals, the sense of smell would be the most 

 highly developed sense. In the giraffe, as in the buffalo and 

 the antelope, the senses of hearing, sight, and smell would 

 be fairly equal. Having such a vast receptacle for fuel 

 storage, the hippopotamus, in order to maintain buoyancy 

 in his swamp habitat, would have a bony skeleton that is 

 not compact, in contrast to the long tibias of the giraffe, 

 which are as hard and dense as ivory. 



The hippopotamus that Dr. Quiring and Captain Hewlett 

 collected was a female. She weighed 2,978 pounds and was 

 still nursing her mtoto, or calf, which weighed 1,200 pounds. 

 The giraffe weighed 2,689 pounds. The thyroid gland of the 

 nursing hippopotamus weighed 118.79 grams; the thyroid 

 gland of the bull giraffe weighed only 64.70 grams. 



Since the hippopotamus is the most placid and least 

 aggressive of the African pachyderms, we should have 



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