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Abe Nelson
A bit of Lake Itasca from Schoolcraft Island, entrance to East arm in distance
A. calamus
Adaptation, convergent, illustration from Henry Fairfield Osborn, "Origin and Evolution of Life"
Adult and young Junco
Adult and young Junco
Adult and young Junco
Adult and young Junco at attention
Adult Junco and young
Adult Junco feeding blueberry to young
Adult Junco feeling young
After shaft, Emu and pheasant, illustration from William Payne Pycraft's book
A grove of white birches with leaves destroyed by the Birch Skeletonizer insect
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"
Alfred Peterson next to car at Pipestone Minnesota
American Bittern's nest
American Bittern's nest
American Bittern's nest
American Bittern's nest and eggs uncovered
American Bittern's nest and eggs uncovered
American Bittern's nest, covered
American Bittern's nest, covered
American Bitterns on nest, young
American Redstart's nest
American Redstart's nest
American Redstart's nest in grapevine
Ampitheater in woods, where the Jewel head grown
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"
Anemone
Anemone and Bellwort, close
Anemone pennsylvanica
Anemone pennsylvanica
Anemone pennsylvanica and where it grows
Antennaria plantaginifolia
Ant fungus garden of Atta texana, image of a photograph from a book
Ant nest of Atta texana, illustration
Ant nest of Atta texana, image of a photograph from a book
Ants, Atta texana, illustration
Ants, sagittal section of worker, Myrmica rubra, illustration
Ants, workers of Atta texana, image of a photograph from a book
A photograph of a four-stories nest of the Yellow Warbler from a page in the printed Annual report of the Field Columbian Museum
Apteryx or Kiwi, illustration from Alfred Newton, "A Dictionary of Birds"
Archaeopteryx, British Museum specimen, illustration from Alfred Newton, "A Dictionary of Birds"
Archaeopteryx, etc., illustration from Henry Fairfield Osborn, "Origin and Evolution of Life"
Archaeopteryx, illustration from "Birds of the World"
Archaeopteryx restoration, deep, illustration from Richard Swann Lull, "Organic Evolution"