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GENERAL ZOOLOGY 



are included all our well-known songsters. The nesting 

 habits are various, but a great number build complicated 

 and often beautiful nests (Fig. 206) in which to rear their 



Fig. 205. Photograph of yellow-bellied sapsuckers 

 American Museum of Natural History 



young. The young when hatched are always in a helpless 

 condition, requiring the care of the parent for a time (com- 

 pare Figs. 207 and 202). The sexes may be alike, or the male 



