Hesperornithidae
Hesperornithidae is a family of extinct flightless birds that lived during the Paleogene period, approximately 66 to 23 million years ago. They are known from fossils found in North America, Europe, and Asia. Hesperornithes were characterized by their long, slender bodies, long necks, and long legs, which are adaptations for a semi-aquatic lifestyle. They had a large, flat beak with serrated edges, which they likely used for feeding on fish and other aquatic prey.
The family Hesperornithidae is divided into two subfamilies: Hesperornithinae and Enaliornithinae. Hesperornithinae includes the type genus
Hesperornithes are thought to have gone extinct around the same time as the non-avian dinosaurs, suggesting
Despite their extinction, Hesperornithes have left a significant fossil record, which has provided valuable insights into