MAMMALS 



207 



both subsist upon plant food. Both have peaceful disposi- 

 tions, but one order has found safety and ability to survive 

 by attaining enormous size and strength ; the other {e.g. 

 rats, squirrels) has found safety in small size. Explain. 



Suppose you were 

 to observe an elephant 

 for the first time, with- 

 out knowing any of its 

 habits. How would 

 you know that it does 

 not eat meat ? That it 

 does eat plant food ? 

 That it can defend it- 

 self ? Why would you make the mistake of thinking that 

 it is very clumsy and stupid ? Why is its skin naked ? 

 Thick? Why must its legs be so straight? Why must it 

 have either a very long neck or a substitute for one ? 

 (Fig. 376.) Are the eyes large or small? The ears? The 

 brain cavity ? What anatomical feature correlates with 

 the long proboscis ? Is the proboscis a new organ not 

 found in other animals, or is it a specialization of one or 

 more old ones ? Reasons ? What senses are especially 



Fig. 376. — Head of African Elephant. 



active in the proboscis ? 



How is it used in drinking ? 

 grasping ? 



In 



Fig. 377. — Molar Tooth 

 African Elephant. 



of 



What evidence that 

 it is a development of the 

 nose? The upper lip? 



The tusks are of use in up- 

 rooting trees for their foliage 

 and in digging soft roots for 

 food. Can the elephant graze ? Why, or why not ? There 

 is a finger-like projection on the end of the snout which is 

 useful in delicate manipulations. The feet have pads to 

 prevent jarring ; the nails are short and hardly touch the 

 ground. Order Why? Key, page 193. 



