1) Palaeornithology 
Paleornithology also known as Avian Paleontology is the scientific study of bird evolution and fossil birds. It is a mix of ornithology and paleontology. Paleornithology began with the discovery of Archaeopteryx. The reptilian relationship of birds and their ancestors, the theropod dinosaurs, are important aspects of paleornithological research. O...
• (n.) The branch of paleontology which treats of fossil birds.
Pa`le·or`ni·thol'o·gy noun [ Paleo- + ornithology .] The branch of paleontology which treats of fossil birds. 
[n] - the paleobiology of birds
palaeornithology noun the paleobiology of birds