feral hybrid of, i. 190.
Duck, penguin, hybrid of, with Egyptian goose, ii. [68].
Duck, wild, difficulty of rearing, ii. [233];
effects of domestication on, ii. [278].
Ducks, breeds of, i. 276-277;
origin of, i. 277;
history of, ibid.;
wild, easily tamed, i. 278-279;
fertility of breeds of, when crossed, i. 279;
with the plumage of Anas boschas, i. 280;