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Fig. 10. (A) Relationship between energy expended per second and speed for a Magellanic penguin swimming unequipped (bottom line) and equipped with antennae (flexible or stiff) of various dimensions. (B) Relationship between the cost of transport and speed for a Magellanic penguin swimming unequipped (bottom line) and equipped with antennae (flexible or stiff) of various dimensions. The arrows show the speeds at which costs of transport are minimized for the various scenarios.





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