Hesperornithidae Marsh, 1872
Key morphological features: These birds had strong legs built for swimming.
Paleoecology: Hesperornithidae were common north of Kansas along the Western Interior Seaway, possibly preferring prey in cooler waters.
FEEDING MODE: Carnivore
Everhart, M. J., 2005. Oceans of Kansas: A Natural History of the Western Interior Sea. Indiana University Press, Bloomington. 322 pp.