Here is my muscovy duck named Big Bird. I rescued her from a live poultry butcher shop. He or she was living in a crowded cage with other poultry birds. I have tamed him or her to sit on my lap or on my computer table.
Unless theres a curly feather on tail (which is sure sign of a drake) voice sexing is the easiest way to identify he or she. If its a loud quack with alot to say, its a she. If its a quiet croaky sound, its a he. Plenty of youtube videos on the noises too. . Beautiful duck, I love my pekins.