Modern BirdsDavid P. Mindell and Joseph W. Brown
This tree diagram shows the relationships between several groups of organisms.
The root of the current tree connects the organisms featured in this tree to their containing group and the rest of the Tree of Life. The basal branching point in the tree represents the ancestor of the other groups in the tree. This ancestor diversified over time into several descendent subgroups, which are represented as internal nodes and terminal taxa to the right.
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Neornithes includes all extant birds. The earliest divergence within Neornithes is between Paleognathae (ratites and tinamous) and Neognathae which includes the two primary taxa Galloanserae and Neoaves (see Groth and Barrowclough 1999, Garcia-Moreno et al. 2003, Cracraft et al. 2004, Edwards et al. 2005)
See references list below for more publications on avian systematics.
Extant birds include about 9000 recognized species, with representatives inhabiting all the major biogeographic regions of the world. Examples of bird groups and their native locales include: loons, auks and buntings in the Holarctic; rheas, motmots and toucans in the Neotropics; ostriches, guineafowl and woodhoopoes in Africa south of the Sahara; pheasants, pittas and babblers in Southeast Asia and northern Indonesia; and emus, cockatoos and owlet-frogmouths from Australia and New Guinea.
Whether modern birds are most closely related to dinosaurs or crocodylian ancestors is a point of current debate. The orders of extant birds appear to have arisen close to each other in time, although their age is uncertain, having been estimated to be about 60 million years old or over 90 million years old based on morphology and fossils (see Feduccia, 1996) and molecular data (Sibley and Ahlquist, 1990; Hedges et al., 1996), respectively.
Birds are unique in having feathers, which enable flight, provide insulation, and are used in visual communication. Modified feathers aid in swimming, sound production, protection via camouflage, water repellence, water transport, tactile sensation, hearing, and support of the body (Stettenheim, 1976). Birds are also warm-blooded, have distinctive bills, produce external eggs, and demonstrate complex parental and reproductive behaviors. Features shared with other reptiles, but not with mammals, include nucleated red blood cells, a single middle ear bone, and a single occipital condyle on the back of the skull. Adaptations for flight include fusion and reinforcement of lightweight bones and presence of a keeled sternum, which supports flight muscles. Birds have highly developed color vision, use vocalizations to mediate social interactions, and are able to detect and react to magnetism (see Gill, 1990).
Classifications of birds following the traditional sequence of orders beginning, approximately, with Struthioniformes (ratites), Procellariformes (albatrosses, petrels), Sphenisciformes (penguins), and Gaviiformes (loons), and ending with Piciformes (woodpeckers) and Passeriformes (perching birds), as found in most field guides and checklists (e.g. Peters 1931-1951), are weakly connected to phylogenetic hypotheses, and tell as much about the history of ornithology as about the history of birds. A recent and revised classification of modern birds (Sibley and Monroe, 1990) reflects phylogenetic hypotheses, with sister groups being assigned coordinate ranks (following Hennig, 1966). However, while the approach is modern, this particular implementation rests on the problematic assumption that melting temperatures for hybridized DNA fragments from pairs of species can be extrapolated to accurately reflect divergence times.
Braun, E. L. and R. T. Kimball. 2002. Examining basal avian divergences with mitochondrial sequences: model complexity, taxon sampling, and seqeunce length. Syst. Biol. 51:614-625.
Christidis, L. and W. Boles. 2008. Systematics and Taxonomy of Australian Birds. CSIRO Publishing, Collingwood, Australia.
Chubb, A. L. 2004. New nuclear evidence for the oldest divergence among neognath birds: the phylogenetic utility of ZENK. Molecular Phylogenetics and Evolution 30:140-151.
Cooper, A. and D. Penny. 1997. Mass survival of birds across the Cretaceous-Tertiary boundary: Molecular evidence. Science 275:1109-1113.
Cracraft, J. 1981. Toward a phylogenetic classification of birds of the world (class Aves). Auk 98: 681-714.
Cracraft, J. 1988. The major clades of birds. In The Phylogeny and Classification of the Tetrapods. (M. J. Benton, ed.), Systematics Assoc. Special Vol. No. 35A, pp. 333-355. Clarendon Press, Oxford.
Cracraft, J. 2001. Avian evolution, Gondwana biogeography and the Cretaceous-Tertiary mass extinction event. Proc. Roy. Soc. Lond. 268B:459-469.
Cracraft, J. and J. Clarke. 2001. The basal clades of modern birds. Pp. 143-156 in New perspectives on the origin and early evolution of birds (J. Gauthier and L. F. Gall, eds.). Peabody Museum of Natural History, Yale University, New Haven, CT.
Cracraft, J., F. Keith Barker, M. J. Braun, J. Harshman, G. Dyke, J. Feinstein, S. Stanley, A. Cibois, P. Schikler, P. Beresford, J. García-Moreno, M. D. Sorenson, T. Yuri, and D. P. Mindell. 2004. Phylogenetic Relationships Among Modern Birds (Neornithes): Toward an Avian Tree of Life. Pp 468-489 in Cracraft, J. and M. J. Donoghue (eds.), Assembling the Tree of Life. Oxford University Press, New York.
Cracraft, J., and D. P. Mindell. 1989. The early history of modern birds: a comparison of molecular and morphological evidence. In The Hierarchy of Life. (B. Fernholm, K. Bremer and H. Jörnvall, eds.), Proc. of Nobel Symposia, pp. 389-403. Elsevier Science Publishers, Amsterdam.
Dyke GJ, Van Tuinen M. 2004. The evolutionary radiation of modern birds (Neornithes): reconciling molecules, morphology and the fossil record. Zool. J. Linn. Soc. 141: 153-177.
Edwards, S. V., B. Fertil, A. Giron, and P. J. Deschavanne. 2002. A genomic schism in birds revealed by phylogenetic analysis of DNA strings. Syst. Biol. 51:599-613.
Edwards, S. V., W. B. Jennings and A. M. Shedlock. 2005. Phylogenetics of modern birds in the era of genomics. Proc. R. Soc. B 272:979–992.
Fain, M. G. and P. Houde. 2004. Parallel radiations in the primary clades of birds. Evolution 58:2558-2573.
Feduccia, A. 1999. The Origin and Evolution of Birds. 2nd edition. Yale University Press: New Haven.
García-Moreno, J. and D. P. Mindell. 2000. Using homologous genes on opposite sex chromosomes (gametologs) in phylogenetic analysis: a case study with avian CHD. Molecular Biology and Evolution 17:1826-1832.
García-Moreno, J., M. D. Sorenson and D. P. Mindell. 2003. Congruent avian phylogenies inferred from mitochondrial and nuclear DNA sequences. Journal of Molecular Evolution 57:27-37.
Gill, F. B. 1990. Ornithology. W. H. Freeman and Co., New York.
Gill, F. and M. Wright. 2006. Birds of the World: Recommended English Names. Princeton NJ: Princeton University Press.
Groth, J. G. and G. F. Barrowclough. 1999. Basal divergences in birds and the phylogenetic utility of the nuclear RAG-1 gene. Mol. Phylog. Evol. 12: 115-123.
Härlid, A. and U. Arnason. 1999. Analyses of mitochondrial DNA nest ratite birds within the Neognathae: supporting a neotenous origin of ratite morphological characters. Proc. Roy. Soc. London 266B: 305-309.
Harrison GL, McLenachan PA, Phillips MJ, Slack KE, Cooper A, Penny D. 2004. Four new avian mitochondrial genomes help get to basic evolutionary questions in the late Cretaceous. Mol.Phylogenet. Evol. 21:974-983.
Hedges, S. B., Parker, P. H., Sibley, C. G., and Kumar, S. 1996. Continental breakup and the ordinal diversification of birds and mammals. Nature 381: 226-229.
Hennig, W. 1966. Phylogenetic Systematics. Univ. of Illinois Press, Urbana.
Johnson, K. P. 2001. Taxon sampling and the phylogenetic position of Passeriformes: evidence from 916 avian cytochrome b sequences. Syst. Zool. 50:128-136.
Lee, K., J. Feinstein, and J. Cracraft. 1997. Phylogenetic relationships of the ratite birds: resolving conflicts between molecular and morphological data sets. Pp. 173-211 in Avian Molecular Evolution and Systematics (D. P. Mindell, ed.). Academic Press, New York.
Livezey, B. C. and R. L. Zusi. 2001. Higher-order phylogenetics of modern Aves based on comparative anatomy. Netherlands J. Zool. 51:179-205.
Livezey, B. C. and R. L. Zusi. 2007. Higher-order phylogeny of modern birds (Theropoda, Aves : Neornithes) based on comparative anatomy. II. Analysis and discussion. Zoological Journal of the Linnean Society 149(1):1-95.
Mayr, E., and Cottrell, G. W. 1979. Revision of the Work of J. L. Peters: Check-list of Birds of the World, Vol. 1. Mus. of Comp. Zool., Cambridge.
Mayr, G. 2005. The Paleogene fossil record of birds in Europe. Biological Reviews 80(4):515-542.
Mayr, G. 2008. Avian higher-level phylogeny: well-supported clades and what we can learn from a phylogenetic analysis of 2954 morphological characters. Journal of Zoological Systematics and Evolutionary Research 46(1):63–72.
Mayr G, Clarke J. 2003. The deep divergences of neornithine birds: a phylogenetic analysis of morphological characters. Cladistics 19:527-553.
Mindell, D. P. (ed.). 1997. Avian molecular evolution and systematics. Academic Press: San Diego.
Mindell, D. P., M. D. Sorenson, D. E. Dimcheff, M. Hasegawa, J. C. Ast, and T. Yuri. 1999. Interordinal relationships of birds and other reptiles based on whole mitochondrial genomes. Syst. Biol. 48: 138-152.
Mindell, D. P., M. D. Sorenson, C. J. Huddleston, H. C. Miranda, Jr., A. Knight, S. J. Sawchuk, and T. Yuri. 1997. Phylogenetic relationships among and within select avian orders based on mitochondrial DNA. Pp. 213-247 in Avian Molecular Evolution and Systematics (D. P. Mindell, ed.). Academic Press: San Diego.
Olson, S. L. 1985. The fossil record of birds. In Avian Biology (D. S. Farner, J. R. King, and K. C. Parkes, eds.), Vol. 8, pp. 79-238. Academic Press, New York.
Paton, T., O. Haddrath, and A. J. Baker. 2002. Complete mitochondrial DNA genome sequences show that modern birds are not descended from transitional shorebirds. Proc. Roy. Soc. Lond. 269B:839-846.
Peters, J. L. 1931-1951. Check-list of Birds of the World, Vols. 1-7. Mus. of Comp. Zool., Cambridge.
Poe S, Chubb AL. 2004. Birds in a bush: Five genes indicate explosive evolution of avian orders. Evolution 58:404-415.
Rasmussen, P. C. and J. C. Anderton. 2005. Birds of South Asia: The Ripley Guide. Lynx Edicions, Barcelona.
Sheldon, F. H. and Bledsoe, A. H. 1993. Avian molecular systematics 1970s to 1990s. Annu. Rev. Ecol. Syst. 24: 243-278.
Sibley, C. G. 1994. On the phylogeny and classification of living birds. J. Avian Biol. 25: 87-92
Sibley, C. G. and Ahlquist, J. E. 1990. Phylogeny and classification of birds: a study in molecular evolution. Yale University Press, New Haven.
Sibley, C. G., and B. L. Monroe, Jr. 1990. Distribution and taxonomy of birds of the world. Yale University Press, New Haven.
Slack, K.E. , F. Delsuc, P.A. McLenachan, U. Arnason and D. Penny. 2007. Resolving the root of the avian mitogenomic tree by breaking up long branches. Mol. Phylogen. Evol. 42:1–13.
Slack, K.E., A. Janke, D. Penny, and U. Arnason. 2003. Two new avian mitochondrial genomes (penguin and goose) and a summary of bird and reptile mitogenomic features. Gene 302:43-52.
Stanley, S. E. and J. Cracraft. 2002. Higher-level systematic analysis of birds: current problems and possible solutions. Pp. 31-43 in Molecular Systematics and Evolution: Theory and Practice (R. DeSalle, G. Giribet, and W. Wheeler, eds.). Birkhäuser Verlag, Basel.
Stettenheim, P. 1976. Structural adaptations in feathers. Proc. 16th International Ornithol. Congr.: 385-401.
van Tuinen, M., Sibley, C. G. & Hedges, S. B. 2000 The early history of modern birds inferred from DNA sequences of nuclear and mitochondrial ribosomal genes. Mol. Biol. Evol. 17: 451-457.
van Tuinen M, Hedges SB. 2004. The effect of external and internal fossil calibrations on the avian evolutionary timescale. J. Paleontol. 78:45-50.
van Tuinen M, Hadly EA. 2004. Error in estimation of rate and time inferred from the early amniote fossil record and avian molecular clocks. J. Mol. Evol. 59:267-276.
Waddell, P. J., Y. Cao, M. Hasegawa, and D. P. Mindell. 1999. Assessing the Cretaceous superordinal divergence times within birds and placental mammals using whole mitochondrial protein sequences and an extended statistical framework. Systematic Biology 48:119-137.
Watson, D. M. 2005. Diagnosable versus distinct: Evaluating species limits in birds. Bioscience 55(1):60-68.
Wetmore, A. 1960. A classification for the birds of the world. Smiths. Misc. Coll. 139: 1-37.
Information on the Internet
Birds of the World
- BirdLife International
- ORNIS. ORNithological Information System provides access to bird specimen and observational records in natural history collections.
- Avibase. An extensive database information system about all birds of the world.
- Birds of the World: Recommended English Names. Supplements the book by Frank Gill And Minturn Wright.
- Animal Diversity Web: Aves. University of Michigan Museum of Zoology.
- BIRDNET. Information about the scientific study of birds from the Ornithological Council.
- SORA: Searchable Ornithological Research Archive. The University of New Mexico.
- Bird Families of the World. Don Roberson.
- David Attenborough's The Life of Birds (PBS)
- Birdix.com: Birds of the World
- Birding Hotspots Around the World
- The Multilingual Birdsearch Engine
- American Ornithologists' Union
- Integrated Bird Conservation in the United States. U.S. North American Bird Conservation Initiative (NABCI)
- American Birding Association
- National Audubon Society
- Bird Studies Canada
- Birding In Canada
- University of Michigan Museum of Zoology Bird Division.
- Cornell Lab of Ornithology.
- All About Birds. Multimedia bird guide and a wealth of information about feeding, attracting, and watching birds. Cornell Lab of Ornithology.
- Online Bird Guide. Cornell Lab of Ornithology.
- eBird. Database and tools to keep track of the birds you see anywhere in North America. Cornell Lab of Ornithology.
- Project FeederWatch. An annual survey of birds that visit feeders in winter. Cornell Lab of Ornithology.
- BirdSource. A partnership between citizens and scientists. National Audubon Society & Cornell Laboratory of Ornithology.
- Birds, Birds, Birds. U.S. Fish and Wildlife Service.
Central and South America
- Neotropical Bird Club
- Belize Audubon Society
- Panama Audubon Society
- Xenornis: the latest sightings of rare birds in Panama
- Asociación Colombiana de Ornitología
- Birds in Suriname, South America
- Aves Argentinas - Asociación Ornitológica del Plata
- Asociación Guyra Paraguay
- Aves Uruguay
- A classification of the bird species of South America. South American Classification Committee, American Ornithologists' Union.
Australia, New Guninea, and Pacific Ocean Islands
- Birds Australia
- Australian Bird Study Association
- Bird Observers Club of Australia
- Australian Museum Ornithology.
- Ornithological Society of New Zealand
- Société Calédonienne d'Ornithologie
- Société d'Ornithologie de Polynésie (MANU)
- Burung Indonesia
Asia and Middle East
- Oriental Bird Club
- 財団法人 日本野鳥の会. Wild Bird Society of Japan (WBSJ)
- Hong Kong Bird Watching Society
- 中華民國野鳥學會. Wild Bird Federation Taiwan (WBFT)
- BirdLife International in Indochina. Cambodia, Myanmar and Vietnam
- สมาคมอนุรักษ์นกและธรรมชาติแห่งประเทศไทย. Bird Conservation Society of Thailand
- Ornithological Society of the Middle East, the Caucasus and central Asia
- Bird Conservation Nepal (BCN)
- Glossary of Bird Species in Chinese, Japanese, and Vietnamese
- SEO/BirdLife (Sociedad Espańola de Ornitología). Spain
- Sociedade Portuguesa para o Estudo das Aves (SPEA). Portugal
- Lega Italiana Protezione Uccelli (LIPU). Italy
- BirdLife Malta
- Ligue pour la Protection des Oiseaux (LPO). France
- The Royal Society for the Protection of Birds (RSPB). UK
- British Trust for Ornithology. UK
- BirdWatch Ireland (BWI)
- BirdGuides. British and Irish birds.
- Fuglaverndarfélag Íslands. Iceland
- Dansk Ornitologisk Forening. Denmark
- Norsk Ornitologisk Forening (NOF). Norway
- Sveriges Ornitologiska Förening (SOF). Sweden
- BirdLife Suomi. Finland
- Vogelbescherming Nederland. Netherlands
- Dutch Birding Association
- Birdnet.de. Germany
- Schweizer Vogelschutz SVS/BirdLife Schweiz. Switzerland
- BirdLife Österreich. Austria
- Česká společnost ornitologická (ČSO). Czech Society for Ornithology
- Ogólnopolskie Towarzystwo Ochrony Ptaków (OTOP). Poland
- Magyar Madártani és Természetvédelmi Egyesület (MME). Hungarian Ornithological and Nature Conservation Society.
- BirdLife Slovenia–Društvo za opazovanje in proučevanje ptic Slovenije (DOPPS)
- Slovenská ornitologická spoločnosť/BirdLife Slovensko. Slovakia
- Eesti Ornitoloogiaühingu (EOÜ). Estonian Ornithological Society
- Latvijas Ornitoloģijas biedrības mājas lapa (LOB). Latvian Ornithological Society.
- Lietuvos Ornitologų Draugija (LOD). Lithuanian Ornithological Society.
- Українське товариство охорони птахів. Ukrainian Society for the Protection of Birds (USPB)
- Societatea Ornitologica Romana. Romania
- Българското дружество за защита на птиците (БДЗП). Bulgarian Society for the Protection of Birds
- Ελληνική Ορνιθολογική Εταιρεία (ΕΟΕ). Hellenic Ornithological Society, Greece
- BirdLife Cyprus
- Russian Bird Conservation Union
Africa and East Indian Ocean Islands
- African Bird Club
- Zambian Ornithological Society
- Birdlife Botswana
- BirdLife South Africa
- Birds of Mauritius
- VIREO: Visual Resources for Ornithology. The Academy of Natural Sciences, Philadelphia.
- The Internet Bird Collection (IBC). An on-line audiovisual library of footage of the world's birds.
- Field Guide: Birds of the World. Flickr group.
- Arthur Grosset's Birds. Mostly South American, European and Australian birds.
- Birds of Kolkata. Indian birds.
- xeno-canto :: bird songs from tropical america
- Zoological Museum Amsterdam Bird Collection. Bird type specimens in 3D.
About This Page
David P. Mindell
California Academy of Sciences, San Francisco, California, USA
Joseph W. Brown
University of Michigan Museum of Zoology, Ann Arbor, Michigan, USA
Page copyright © 2005 David P. Mindell and Joseph W. Brown
Page: Tree of Life Neornithes. Modern Birds. Authored by David P. Mindell and Joseph W. Brown. The TEXT of this page is licensed under the Creative Commons Attribution-NonCommercial License - Version 3.0. Note that images and other media featured on this page are each governed by their own license, and they may or may not be available for reuse. Click on an image or a media link to access the media data window, which provides the relevant licensing information. For the general terms and conditions of ToL material reuse and redistribution, please see the Tree of Life Copyright Policies.
- First online 13 January 1997
- Content changed 14 December 2005
Citing this page:
Mindell, David P. and Joseph W. Brown. 2005. Neornithes. Modern Birds. Version 14 December 2005 (under construction). http://tolweb.org/Neornithes/15834/2005.12.14 in The Tree of Life Web Project, http://tolweb.org/