Hesperornis
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| phylum | Chordata | Hesperornis was a large bird, reaching up to 6 feet (1.8 m) in length. It had virtually no wings, and swam with its powerful hind legs. Fossil evidence shows that the toes were probably lobed, as in today's grebes, rather than webbed as in those of loons. Like many other Mesozoic birds such as Ichthyornis, Hesperornis had teeth as well as a beak, which were used to hold prey.
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| clade | Avialae | |
| clade | Hesperornithes | |
| family | Hesperornithidae | |
| genus | Hesperornis | |
| Temporal range | Late Cretaceous |
