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Updated: August 13, 2026
These might be called the organs of courtship, such as the peacock's tail, the plumes of the birds-of-paradise, and the brilliant plumage of humming birds and many others. The song of birds is another example, and sound is produced in many Fishes for a similar purpose. In the South American species, Rhinoderma darwinii, the enlarged vocal sacs are used for this purpose.
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