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These ducks look so cool! =) I work at a hotel with a lagoon in the middle, and we have ducks swimming in the lagoon all the time. These particular ducks are called Crested ducks. We have guests asking us all the time " What is that thing on their head?! looks like a wig"
Apparently, Crested ducks are a duck breed descended from the Mallard and it gets its appearance because it is heterozygous for a genetic mutation causing a deformity of the skull.