Plesiosaurs are unique in being the only underwater fliers with four ‘wings’, and how the two pairs worked in relation to one another is a matter of some controversy. Newman's hypothesis of porpoising seems to provide a possible solution.

Any discussion of plesiosaur locomotion must take into account the different modes of plesiosaur life: the long-necked forms were fish-eating surface paddlers and the short-necked were diving cephalopod feeders.

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