What structural modification of the tail serves as the primary propeller for the yellow-bellied sea snake?
Answer
A laterally flattened, paddle-shaped tail
The transition to a fully oceanic life necessitated profound structural changes, most notably in the posterior end of the animal. The typical tapering tail found in land snakes has been drastically altered into a laterally flattened, paddle-like shape. This modification functions as the main propulsive organ, generating the necessary thrust for efficient movement through the water column. This specialization emphasizes aquatic propulsion over terrestrial balance or maneuvering, highlighting the commitment to remaining water-bound.
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