Is this a Muscovy duck?

I am completely new to this and wondered what bird this is. Is it a Muscovy Duck? I have tried to find it in my bird books and online and this is the closest I could find! It was by a stream with a large group of mallards and was the only one. It was quite large, goose sized, with what looks like a red wattle. I couldn’t see if the feet were claws or if it was a water bird. Any help would be appreciated!