Male birds tend to be better singers than females—but does the basis for this difference lie in the brain or in the syrinx, the bird equivalent of our larynx? The researchers behind a new study from The Auk: Ornithological Advances analyzed the muscle fibers in the syrinxes of male and female birds from a range of species and found, to their surprise, that the amount of "superfast" muscle wasn't typically related to differences in vocal ability between the sexes.
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Muscle fibers alone can't explain sex differences in bird song
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