A familiar species all over the northern hemisphere and the
ancestor of several domestic breeds, highly sociable and not averse to hybridising with any mallard-type species.
Found in all habitats except high mountains, tundra and desert, it has been introduced to many countries the
world over. This causes conservation problems with native species, added to which are large numbers of feral birds.
Several of the preceeding species are becoming vulnerable due to hybridisation. Other species are so closely
related as to cause taxonomic headaches. Mexican Duck was only recently split, and Mariana Mallard probably became
extinct before its true status could be verified.
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