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Adaptation, convergent, illustration from Henry Fairfield Osborn, "Origin and Evolution of Life"
After shaft, Emu and pheasant, illustration from William Payne Pycraft's book
Air sacs, diagrammatic drawing, illustration from William Payne Pycraft, "History of Birds"
Air sacs, schematic view, illustration from Frank E. Beddard, "The Structure and Classification of Birds"
Albatross breeding colony, image from "Birds of the World"
Anatomy, salivary gland, tongues, Syrinx, illustration by R.W. Shufeldt, "Myology of the Raven"
Ancestral tree of birds image from Henry Fairfield Osborn, "Origin and Evolution of Life"
Ancestral tree of Birds image from Henry Fairfield Osborn, "Origin and Evolution of Life"
Apteryx or Kiwi, illustration from Alfred Newton, "A Dictionary of Birds"
Archaeopteryx, British Museum specimen, illustration from Alfred Newton, "A Dictionary of Birds"