The Cornell Lab Bird Academy › Discussion Groups › Bird Identification › Mystery duck among Muscovy Ducks (19 May, Caguas, Puerto Rico) GriffinParticipant Chirps: 5 You must be logged in to reply to this topic. EstebanParticipant Chirps: 164 seems like an albino mallard AnnabethParticipant Chirps: 107 Yes it looks like it is an albino mallard. The bill is very similar.