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A heterocercal tail is characterized by an asymmetrical shape, where the upper lobe is typically larger and extends further than the lower lobe. This tail structure is commonly found in certain fish species, such as sharks and some bony fishes, and helps provide lift and propulsion. The design allows for greater maneuverability in the water and aids in maintaining balance while swimming. Overall, the heterocercal tail is an adaptation that enhances the swimming efficiency of these aquatic animals.

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