1) Transitional fossil
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https://www.crosswordclues.com/clue/ichthyornis
• (n.) An extinct genus of toothed birds found in the American Cretaceous formation. It is remarkable for having biconcave vertebrae, and sharp, conical teeth set in sockets. Its wings were well developed. It is the type of the order Odontotormae.
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http://thinkexist.com/dictionary/meaning/ichthyornis/
extinct seabirds of the Late Cretaceous Period (99 million to 65 million years ago) found as fossils in the U.S. states of Wyoming, Kansas, and ... [1 related articles]
Found on
http://www.britannica.com/eb/a-z/i/4
(pronounced ik-thee-ORN-is) Ichthyornis meaning fish bird) was an 8 inch (20 cm) long, tern-like, extinct bird that lived during the late Cretaceous period (135-70 million years ago). It had a large head, toothed jaws, and long beak. This powerful flyer is the oldest-known bird that had a keeled breastbone (sternum) similar to that of modern birds....
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http://www.enchantedlearning.com/subjects/dinosaurs/glossary/
Ich`thy·or'nis noun [ New Latin , from Greek
'ichqy`s ,
-y`os , a fish + ... bird.]
(Paleon.) An extinct genus of toothed birds found in the American Cretaceous formation. It is remarkable for having biconcave vertebræ, and sharp, conical teeth set in sockets. Its wi...
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http://www.encyclo.co.uk/webster/I/2
ichthyornis A prehistoric toothed bird, similar to a gull, that lived during the Cretaceous period; literally, a “fish-bird”.
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http://www.wordinfo.info/words/index/info/view_unit/1510/
an extinct genus of toothed birds having vertebrae resembling those of fishes.
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https://www.infoplease.com/dictionary/ichthyornis
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