eg, various breeds of chickens can reproduce together, but a chicken and a duck cannot, therefore they are different 'kinds' or 'species'
Duck is not a species. It is a group of genera. ie:
Dendrocygna ,
Aix,
Anas,
Aythya,
Somateria,
Melanitta,
Clangula,
Bucephala,
Mergus,
Lophodytes,
Mergellus,
Oxyura &
Nomonyx. Some of these genera have several species which cannot interbreed, and those of the different genera cannot. So explain the "Duck Kind."
Edited by bluescat48, : clarity
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