THE STRUCTURE AND ACTIVITIES OF BIRDS 337 



cyclostomes and fishes, but they are modified somewhat by the 

 omission of several of the digits and the union of certain of the 



ft 



FIG. 214. The most important forms of birds' feet. 



a, clinging foot of a swift; b, climbing foot of woodpecker; c, scratching 

 foot of pheasant ; d, perching foot of ouzel ; e, foot of kingfisher ; f, seizing 

 foot of falcon ; g, wading foot of stork ; h, running foot of ostrich ; i, swimming 

 foot of duck ; k, wading foot of avocet ; 1, diving foot of grebe ; m, wading 

 foot of coot; n, swimming foot of tropic-bird. (From Sedgwick.) 



bones that remain. To this axis of bones and muscles and ten- 

 dons the long wing feathers are attached. 



