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THE ANIMALS AND MAN 



Note the foot of the robin, bluebird, catbird, wren, warb- 

 ler, and other passerine or perching birds. It has three 

 unwebbed toes in front and a long hind toe perfectly oppos- 

 able to the middle front one. This is the perching foot. 



FIG. 120. Ostriches on 

 graph from life.) 



ostrich-farm at Pasadena, California. (Photo- 



Note the so-called zygodactyl foot of the woodpecker, with 

 two toes projecting in front and partly yoked together, and 

 two similarly yoked projecting behind. Note the webbed 

 swimming-foot of the aquatic birds; note the different de- 

 grees of webbing, from the totipalmate, where all four toes 

 are completely webbed, palmate, where the three front toes 

 only are bound together but the web runs out to the claws, 



