THE STRUGGLE FOR EXISTENCE 359 



Certain flies, known as syrphus flies, imitate bees in color, 

 size, and general appearance so closely as to deceive ex- 

 perienced people. 



Many examples might be given of the manner in which 

 animals are protectetl from other and stronger ones. In the 

 same way, animals are provided with means of protection 

 against climate, scarcity of food, etc. Those animals living 

 in cold climates are provided with thick coats of fur, 

 feathers, or hair. Those that hibernate throughout the 

 winter lay up during the summer a large amount of fat, 

 to act as food when none is obtainable. 



