OP THE BRITISH ISLANDS. 387 



Genus NYROCA, or Pochards. 



Type, NYROCA AFEICANA. 



Nyroca, of Fleming (1822). The birds in the present genus are charac- 

 terised by having the primaries marked with grey, the indentations of the upper 

 mandible prominent, the bill smooth at the base, and not widening out towards 

 the tip. 



Ten species are included in the present genus, two of which, however, are at 

 present of doubtful rank. The Pochards are practically cosmopolitan in their 

 distribution. Two species are included as British, one indigenous to our Islands, 

 and the other an abnormal migrant to them. 



The Pochards are found upon fresh water and in maritime localities, showing 

 a decided preference for pools and lakes containing plenty of cover. Their 

 movements on the land are awkward, but in the water these birds swim and dive 

 with ease. They are social and gregarious, especially during the non-breeding 

 season. Their flight is rapid and strong, if somewhat laboured at its commence- 

 ment. They feed both by day and night on animal and vegetable substances, 

 the diet varying a good deal in the several species. Their notes are harsh and 

 unmusical. They are monogamous. Their rude, down-lined nests are made 

 amongst the herbage or float some distance from shore amidst reeds and rushes. 

 Their eggs are numerous, and various shades of grey or buff in colour. 



