Hesperornithes

== Translingual == === Etymology === Plural of Hesperornis === Proper noun === †Hesperornithes An extinct, highly specialized clade of aquatic avialans closely related to the ancestors of modern birds. === References === Hesperornithes on Wikipedia.Wikipedia Hesperornithes on Wikispecies.Wikispecies Category:Hesperornithes on Wikimedia Commons.Wikimedia Commons