I'm wondering if there has been any recent research that would account for the existence (as in evolution) of the domestic muscovy duck.
People in the bird-hobbyist world are taught that it was developed from the "wild muscovy" which looks like a smaller version of the domestic muscovy and also is a native of Central/South America.
Both ducks get referred to as "Cairina Moschata".
The wild:-
and the domestic:-
The problem with this popular belief is that the wild has a different number of chromosomes from the domestic and interbreeding (I'm told) produces sterile offspring.
As "hobby farmers" we keep an awful lot of these ducks - and I can't put my hand on my heart and tell people that they descended from the wild muscovy.