The male club-winged manakin (Machaeropterus deliciosus), who sings by knocking together his heavy wing bones more than one hundred times per second, was found to possess unusually robust wing bones. | Harper's Magazine

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The male club-winged manakin (Machaeropterus deliciosus), who sings by knocking together his heavy wing bones more than one hundred times per second, was found to possess unusually robust wing bones.

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The male club-winged manakin (Machaeropterus deliciosus), who sings by knocking together his heavy wing bones more than one hundred times per second, was found to possess unusually robust wing bones.

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