Genetically Muscovy are nearer a goose than a duck so I've read. The ducks on our pond certainly think so and none of them socialise with the Muscovies, definitely seen as odd by the others - grass eaters, roost in trees, good mothers, eat from humans hands. The geese see the Muscovies as different too and don't socialise with them either. The Muscovies don't give a jot so it seems
Mallards - we get loads every year on our pond and they lay anywhere in long grass or tree stumps but they are wild here whilst appreciating the 5 star it has to be said.
The one in the hen shed has ceased to lay there since I opened the door last week and saw her, so she's probably started a new nest. Presently we have one laying in a very high up window box

, last year one made a nest on the bonfire

. Still haven't eaten that egg yet, it's in the queue.