» A Qualitative and Quantitative Study of the Lung of an Ostrich - The colossal body size, the relinquishment of flight and the extreme thermal stresses on the ground make the examination of an ostrich’s lungs rewarding.
» Animal Files: Birds - Here you can find information on bird biology, bird mythology, symbolism, birds in shamanism and in dreams.
» Avian Reproduction: Anatomy and the Bird Egg - Notes on the bird reproductive system and the development of the embryo, with explanatory drawings and photographs.
» Avian Reproduction: Clutch Size, Incubation and Hatching - Notes on clutch size optimization in birds, reproductive success, embryo development, incubation and the hatching process, with links to other similar articles.
» Bird Respiratory System - Article explaining how air sacs play an important part in the gaseous exchange in birds, with many diagrams.
» Bird Skull Collection - Images and data about skulls of western Palearctic and Tropical species, with complete skeletons of some species.
» Birdnet - Ornithological Council's website with comprehensive data about North American ornithological resources.
» Electronic Resources on Ornithology - Annotated links and ornithological articles by Christopher Majka.
» Flapping Flight: Inertial Studies - Technical article by researchers at Bristol University who measured the wings of bats and birds and calculated their efficiency in flight.
» Flight in Birds - How do birds fly? An introduction to flight in birds examining wing shape, airflows, flapping flight and gliding.
» Intermittent Flight Strategies - Paolo Viscardi at the University of Leeds examines intermittent flight whereby wing beat pattern is varied by the bird while flying.
» List of Essays - Many articles on every aspect of bird life. A comprehensive and useful resource.
» Mechanics of Respiration in Birds - Notes and diagrams explaining how birds ventilate their lungs.
» Ornithological Web Library - A comprehensive annotated library of over 1,800 ornithological and birding related links.
» Ornithology: Science of Birds - Includes data on the science of wild birds, with an emphases on conservation and education.
» Population Dynamics - Essay discussing the factors behind the variation in the number of individuals in a bird population over time.
» Site Tenacity - Many birds return to the same nesting site each season. This essay discusses why this should be so.
» Smithsonian Migratory Bird Center - Ecological and land-management research, education, conservation policy, data on migration and fact sheets.
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