Clarke, Julia A.; Peabody Museum of Natural History.
(New York, NY : American Museum of Natural History, 2004)
"Charles Darwin commented that Ichthyornis, as one of the 'toothed birds' from the late Cretaceous of Kansas, offered some of 'the best support to the theory of evolution' (in litt., C. Darwin to O.C. Marsh, August 31, ...