The Muscovy (cairina moschata) is a perching duck from Cental & South America; it is a non migrating duck which roosts in trees. In captivity they grow quite large, much largher than wild scovies. There are not many wild types kept in captivity.

Mallard ducks(Anas Platyrhynchos) are the parent stock of our domestic ducks such as the Pekin, Campbells, swedes, Calls, orpingtons, et cetera. They have a wide area of homeland. Exhibition type Mallards are more racy and longer billed than wild stock, there are also domestic Mallards which are heavier than wilds but to the untrained eye look the same.

Muscovies and mallards do interbreed producing sterile young called mulkes if from a Muscovie over Mallard mating and hinnies form the opposite breeding. Mule ducks are desired as meat but the hinnies are undesirable. Rate of growth and finish are the prerequisites.