hesperornis - definition and synonyms

  1.   From our crowdsourced Open Dictionary
    a large bird with very small wings, which lived about 80 million years ago. It could not fly, but could swim and lived in water.

    Hesperornis has been referred to as the "only marine dinosaur" and is certainly the only one for which we have a fossil record.

    Submitted on 26/10/2011