Functional traits offer a rich quantitative framework for developing and testing theories in evolutionary biology, ecology and ecosystem science. However, the potential of functional traits to drive theoretical advances and refine models of global change can only be fully realised when species-level information is complete. Here we present the AVONET dataset containing comprehensive functional trait data for all birds, including six ecological variables, 11 continuous morphological traits, and information on range size and location. Raw morphological measurements are presented from 90,020 individuals of 11,009 extant bird species sampled from 181 countries. These data are also summarised as species averages in three taxonomic formats, allowing integration with a global phylogeny, geographical range maps, IUCN Red List data and the eBird citizen science database. The AVONET dataset provides the most detailed picture of continuous trait variation for any major radiation of organisms, offering a global template for testing hypotheses and exploring the evolutionary origins, structure and functioning of biodiversity.

African Climate and Development Initiative University of Cape Town Cape Town South Africa

Animal Biology Division Institute of Biological Sciences College of Arts and Sciences University of the Philippines Los Baños Los Baños Laguna Philippines

Auckland Museum Auckland New Zealand

Biodiversity and Biocomplexity Unit Okinawa Institute of Science and Technology Graduate University Kunigami gun Okinawa Japan

Biodiversity Initiative Houghton Michigan USA

Biodiversity Research Centre University of British Columbia Vancouver British Columbia Canada

Biogeography and Biodiversity Lab Institute of Physical Geography Goethe University Frankfurt Frankfurt am Main Germany

Biological and Environmental Sciences University of Stirling Stirling UK

Bioversity International CGIAR Parc Scientifique Agropolis 2 Montpellier France

Bird Group Department of Life Sciences The Natural History Museum Tring UK

Birds Canada Port Rowan Ontario Canada

BSG Ecology Worton Park Worton Witney UK

Canterbury Museum Christchurch New Zealand

CATIE Cartago Turrialba Costa Rica

CE3C Depto de Ciências Agráriase Engenharia do Ambiente Angra do Heroísmo Açores Portugal

Center for Macroecology Evolution and Climate GLOBE Institute University of Copenhagen Copenhagen Denmark

Central American Institute for Studies on Toxic Substances Universidad Nacional de Costa Rica Heredia Costa Rica

Centre for Biodiversity and Environment Research Department of Genetics Evolution and Environment University College London London UK

Centre for Statistics in Ecology the Environment and Conservation University of Cape Town Cape Town South Africa

CIBIO InBIO Research Centre in Biodiversity and Genetic Resources University of Porto Vairão Portugal

Colección Boliviana de Fauna Museo Nacional de Historia Natural Ministerio de Medio Ambiente y Agua La Paz Bolivia

College of Forest Resources and Environmental Science Michigan Technological University Houghton Michigan USA

Coordenação de Zoologia Museu Paraense Emílio Goeldi Belém Pará Brazil

Cornell Lab of Ornithology Ithaca New York USA

Danish Institute for Advanced Study University of Southern Denmark Odense Denmark

Departamento de Ecologia Universidade Federal do Rio Grande do Sul Porto Alegre Brazil

Department for Continuing Education University of Oxford Oxford UK

Department of Animal and Plant Sciences University of Sheffield Sheffield UK

Department of Biological Physical and Mathematical Sciences University of Environment and Sustainable Development Somanya Ghana

Department of Biological Sciences and Biodiversity Collections The University of Texas at El Paso El Paso Texas USA

Department of Biological Sciences and Museum of Natural Science Louisiana State University Baton Rouge Louisina USA

Department of Biological Sciences Goethe University Frankfurt Frankfurt am Main Germany

Department of Biological Sciences SUNY Oswego Oswego New York USA

Department of Biology Missouri State University Springfield Missouri USA

Department of Biotechnology Halu Oleo University Kendari Sulawesi Tenggara Indonesia

Department of Ecology and Evolutionary Biology Princeton University Princeton New Jersey USA

Department of Ecology and Evolutionary Biology University of Tennessee Knoxville Tennessee USA

Department of Ecology and Evolutionary Biology University of Toronto Toronto Ontario Canada

Department of Ecology Faculty of Science Charles University Praha Czech Republic

Department of Ecology Institute of Zoology Johannes Gutenberg University Mainz Mainz Germany

Department of Environmental Science and Policy George Mason University Fairfax Virginia USA

Department of Evolution Ecology and Organismal Biology Ohio State University Columbus Ohio USA

Department of Integrative Biology University of Guelph Guelph Ontario Canada

Department of Life Sciences Imperial College London Ascot UK

Department of Life Sciences Natural History Museum London UK

Department of Natural History Royal Ontario Museum Toronto Ontario Canada

Department of Natural Resources and Environmental Sciences University of Illinois at Urbana Champaign Urbana Illinois USA

Department of Organismic and Evolutionary Biology Harvard University Cambridge Massachusetts USA

Department of Ornithology American Museum of Natural History New York New York USA

Department of Recent Vertebrates Royal Belgian Institute of Natural Sciences Brussels Belgium

Department of Wildlife Ecology and Conservation University of Florida Gainesville Florida USA

Department of Zoology and Aquatic Sciences Copperbelt University Kitwe Zambia

Department of Zoology National Museums of Kenya Nairobi Kenya

Department of Zoology Palacký University Olomouc Czech Republic

Department of Zoology School of Natural Sciences Trinity College Dublin Dublin Ireland

Department of Zoology University of Cambridge Cambridge UK

Department of Zoology University of Oxford Oxford UK

Depto de Ecologia e Zoologia Centro de Ciências Biológicas Universidade Federal de Santa Catarina Florianópolis Brazil

División Ornitología Museo Argentino de Ciencias Naturales Bernardino Rivadavia CONICET Buenos Aires Argentina

Durban Natural Science Museum Durban South Africa

Fenner School of Environment and Society Australian National University Canberra Australia

Finnish Museum of Natural History University of Helsinki Helsinki Finland

FitzPatrick Institute of African Ornithology University of Cape Town Rondebosch Cape Town South Africa

Future Fit Foundation Spitalfields London UK

GEES and Birmingham Institute of Forest Research University of Birmingham Birmingham UK

Institut de Systématique Evolution Biodiversité Muséum National d'Histoire Naturelle CNRS SU EPHE UA Paris France

Institut für Geowissenschaften Goethe University Frankfurt Frankfurt am Main Germany

Institute for Ecology Evolution and Diversity Goethe University Frankfurt Frankfurt am Main Germany

Institute of Animal Health and Comparative Medicine Graham Kerr Building University of Glasgow Glasgow UK

Institute of Ecology Peking University Beijing China

Institute of Zoology Chinese Academy of Sciences Beijing China

Instituto de Ciencias Naturales Universidad Nacional de Colombia Bogotá Colombia

Instituto de Ecología Universidad Mayor de San Andres La Paz Bolivia

Instituto Nacional de Pesquisas da Amazônia Manaus Brazil

Laboratório de Ecologia e Evolução de Aves Departamento de Zoologia Universidade Federal de Pernambuco Recife Brazil

Lee Kong Chian Natural History Museum National University of Singapore Singapore Singapore

Louisiana State University Health Sciences Center Shreveport Shreveport Louisina USA

Moore Laboratory of Zoology Occidental College Los Angeles California USA

Museu de Zoologia da Universidade de Sao Paulo São Paulo SP Brazil

Museum of Comparative Zoology Harvard University Cambridge Massachusetts USA

Museum of Natural History University of the Philippines Los Baños Los Baños Laguna Philippines

Museum of Vertebrate Zoology and Department of Integrative Biology University of California Berkeley Berkeley California USA

Museum Zoologicum Bogoriense Research Centre for Biology Indonesian Institute of Sciences Bogor Indonesia

Natural History Museum of Denmark University of Copenhagen Copenhagen Denmark

Natural History Research Center Shanghai Natural History Museum Shanghai China

Natural History Section Department of National Museum Colombo Sri Lanka

Natural Resources Institute Finland Natural resources Migratory fish and regulated rivers Oulu Finland

Nature based Solutions Initiative Department of Zoology University of Oxford Oxford UK

Operational Directorate Natural Environment Royal Belgian Institute of Natural Sciences Brussels Belgium

Ornithology Section Zoological Research Museum Alexander Koenig Bonn Germany

Ornithology Section Zoology Division Philippine National Museum Rizal Park Manila Philippines

Peabody Museum of Natural History Yale University New Haven Connecticut USA

Programa de Biología Universidad de la Salle Bogotá Colombia

School for Environment and Sustainability University of Michigan Ann Arbor Michigan USA

School of Biological Sciences Royal Holloway University of London Egham UK

School of Biological Sciences University of Auckland Auckland New Zealand

School of Biological Sciences University of Bristol Bristol UK

School of Biological Sciences University of Utah Salt Lake City Utah USA

School of Earth Sciences University of Bristol Bristol UK

Senckenberg Biodiversity and Climate Research Centre Frankfurt am Main Germany

Senckenberg Natural History Collections Museum of Zoology Dresden Germany

South African Ringing Unit University of Cape Town Rondebosch Cape Town South Africa

Swiss Federal Institute for Forest Snow and Landscape Research WSL Birmensdorf Switzerland

UN Environment Programme World Conservation Monitoring Centre Cambridge UK

Universidad Nacional Agraria La Molina Av La Molina s n La Molina Lima Peru

University of Kansas Lawrence Kansas USA

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