501. Chen hyberboreus (Pall.). 

 Snow-Goose. 



502. Cygnus olor (Gmel.). 

 Mute Swan. 



503. Cygnus immutabilis, Yarr. 

 Polish Swan. 



504. Cygnus musicus, Bechst. 

 Whooper Swan. 



505. Cygnus bewicki, Yarr. 

 Bewick's Swan. 



506. Tadorna cornuta (Gmel.). 

 Common Sheld-duck. 



507. Casarca rutila (Pall.). 

 Buddy Sheld-duck. 



508. Anas boscas (Linn.). 

 Mallard. 



509. Chaulelasmus streperus (Linn.). 

 Gadwall. 



510. Spatula clypeata (Linn. ). 

 Shoveller. 



511. Marmaronetta angustirostris (MSnetr.). 

 Marbled Duck. 



512. Nettion crecca (Linn.). 

 Common Teal. 



513. Nettion carolinense (Gmel.). 



American Green-winged Teal. 



514. Nettion formosum (Georgi.). 

 Baikal Teal. 



