Hesperornithiformes

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Hesperornithiformes

[‚hes·pə‚rȯr‚nith·ə′fȯr‚mēz]
(paleontology)
An order of ancient extinct birds; individuals were large, flightless, aquatic diving birds with the shoulder girdle and wings much reduced and the legs specialized for strong swimming.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.