A group of birds characterized by having unequal or asymmetrical arrangements of their vocal muscles, particularly in their voice box.
From Greek 'anisos' (unequal) + 'mys' (muscle) + '-odi' (relating to song/voice). Ornithologists developed this taxonomic term to describe birds with unique vocal anatomy.
These birds have a quirky asymmetrical voice box that allows them to produce complex songs and sounds—some can literally sing two different notes at once because their vocal muscles aren't balanced!
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