THE STRUCTURE AND ACTIVITIES OF BIRDS 353 





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FIG. 232. Four young killdeers just hatched. They were able to run 

 about as soon as hatched. Notice their resemblance to their surroundings. 

 These young hatched from the eggs shown in Fig. 220. (Photo, by Hegner.) 



FIG. 233. Young blue jays. Young of this type are said to be altricial. 

 They are naked and blind when hatched. (Photo, by Hegner.) 



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