Found in articles
См. en:List of national birds Gill F., Donsker D. & Rasmussen P.[англ.] (Eds.): Pheasants, partridges, francolins (англ.). IOC World Bird List (v11.2)
and mode of evolution in an extinct clade of birds with ancient DNA: The giant moas of New Zealand // Proceedings of the National Academy of Sciences
Cottrell, W. (1979): Check-list of Birds of the World. Museum of Comparative Zoology. Proctor, N. & Lynch, P. (1993): Manual of Ornithology: Avian Structure
Diurnal Birds of Prey Through Woodpeckers // Golden Eagle: Aquila chrysaetos (Linnaeus) in The Birds of British Columbia. — Vancouver: University of British
taxonomy of birds of the world. — New Haven: Yale University Press, 1990. (англ.) Sibley C. G., Monroe B. L. A supplement to 'Distribution and taxonomy of birds