228 



THE ANIMALS AND MAN 



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

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

 unwel)bed toes in front and a long hind toe perfectly oppos- 

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



(jslrith-farm at Pasaden 



Californi: 



(Photo- 



FlG. 120. ( Vstnchcs on 

 graph from life.j 



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, froj;ii 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, 



