WING OF HOATZIN. 



1. The wing of a newly hatched hoatzin showing the large claws and free finger-tip 

 used in climbing. 



2. The same wing at the period when the climbing stage is past, but before the 

 claws have become absorbed. 



3. The wing of a young game-bird showing the free finger-tip, but minus da^ra, 

 and the accelerated growth of the wing quills. (After Pycraft). i-io Primaries 

 and secondaries, respectively. C » Coverto. P = Primaries. N = Nestling down. 



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