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International Ornithologists' Union

Abbreviation	IOU
Main organ	Committee of Representatives and International Ornithological Congress
Affiliations	International Union of Biological Sciences
Website	www.internationalornithology.org
Formerly called	International Ornithological Committee

The International Ornithologists' Union (IOU) is an international organization for the promotion of ornithology. It links basic and applied research and nurtures education and outreach activities. Specifically, the IOU organizes and funds global congresses on ornithology at regular intervals, sets up and supports commissions and committees on various aspects of avian biology and conservation, and initiates and backs other international ornithological activities with specific aims consistent with its own mission and goal.^[1] It discloses the names and professional affiliations of its members on its website to encourage international collaboration and networking. The IOU acts as the Ornithology Section of the IUBS.

The IOU has the objective of supporting, promoting, and advancing avian biology by disseminating ornithological knowledge to the scientific community and the public; interacting with other scientific organizations, foundations, and institutions that share similar interests and goals; stimulating and strengthening locally-based research that includes the participation of amateur ornithologists who contribute valuable data and insights; cultivating relationships among ornithologists internationally; and fostering knowledge transfer between basic research and applied sciences, such as conservation, that can benefit from the findings and recommendations of ornithology.

International congresses in science were rare until the late nineteenth century. One of the first ones was the 1st International Ornithological Congress in 1884,^[2] which was motivated by a borderless problem in avian biology: avian migration. This is one of the most remarkable aspects of avian biology, as many bird species travel north and south every year, but little was understood about it at that time. In Europe, where many countries were involved, studying avian migration demanded an international effort. Rudolf Blasius and Gustav von Hayek devised a grand plan for a multi-nation program on avian migration in Europe, secured the support of Crown-Prince Rudolf of Austria-Hungary, and arranged the 1st International Congress of Ornithology in Vienna, April 1884, which concentrated mainly on migration studies. They established a complicated system to collect and publish migration data from Europe, but it collapsed in the 1890s due to too much information that was not analyzed.

The 2nd Congress in Budapest in 1891 focused mainly on avian migration, but also included other areas of avian biology such as a major summary of avian classification by Richard Bowdler Sharpe. The 3rd Congress in Paris covered the whole range of ornithological research, and this was followed in London, 1905 and Berlin, 1910 where the next congress, planned for Sarajevo, Yugoslavia, in 1915 became a sign of the upcoming First World War. Ernst Hartert was largely responsible for reviving the congresses in Copenhagen, in 1926, where future meetings were set at every four years. The Règlement des Congrès Ornithologiques Internationaux, adopted in 1932, was only published at the Rouen Congress in 1938. It formalized the establishment and operation of the International Ornithological Committee. World events again prevented the staging of the 1942 Congress scheduled for the USA, and the next congress to be held was the 10th in Uppsala, Sweden, in 1950.

Plenary lectures by world specialists giving summaries of advances in the various fields of ornithology at the time have been a highlight of congresses: Heinroth on the ethology of ducks and Lucanus on avian physiology at the 5th Congress; Lambrecht on avian physiology and Dunker on avian genetics at the 7th; Nice on the life history of the Song Sparrow at the 8th; Mayr on avian speciation, Dorst on avian migration, Tinbergen on behavior and Lack on ecology at the 10th; Sibley and Ahlquist with The Tapestry – the first molecular phylogeny of the Aves – at the 19th; Schodde and Christidis on the Gondwanan origin of the Australasian avifauna and global implications at the 20th; Walter Bock's Presidential debate between Martin and Sereno on the origin of birds from reptilian ancestors at the 23rd ; and Bairlein on migration, illustrating the huge advances since Dorst, at the 26th. Presidential addresses, moreover, sometimes reviewed important historical aspects in ornithology, such as the contribution of amateurs in biology, the role of museum development, and, as at the 23rd Congress, the history of the international ornithological congresses themselves.

The first congress outside Europe was held in Ithaca, New York, in 1962, and the first for the southern hemisphere was held in Canberra, Australia, in 1974. Congresses in their current format began in Berlin, 1978, where Donald Farner set up the first International Scientific Program Committee, and formulated new organizational Statutes and bylaws to replace the Règlement. A pattern of plenary lectures, symposia, contributed papers, and round table discussions was established there too. By 1986, it became clear that the tasks of secretaries-general appointed to arrange congresses had become too extensive, and that more organizational continuity was needed for managing the International Ornithological Committee. That led to the creation of the position of permanent secretary at the Ottawa Congress in Canada in 1986; Walter Bock was the foundation appointee, holding the position until 1998, when Dr. Dominique Homberger took over at the Durban Congress in South Africa.

Organized by the IOU, the International Ornithological Congress series is the oldest and largest series of international meetings for bird scientists. The series started in 1884 and has been held every four years since 1926, except for two times when the Second World War disrupted the schedule.

IOU members can enjoy access to the IOU webinars by ornithologists; discounts on books by selected publishers; members-only registration fees to the International Ornithological Congresses, and other IOU-sponsored events; participation in and/or establishment of working groups to address specific projects or issues; voting rights on particular IOU matters and more. The IOU offers different membership options based on the World Bank economic income categorization. Members can also support the IOU's mission and programs through donations.

The IOU webinars are a series of online lectures that showcase the latest research and developments in ornithology. The webinars feature speakers from different countries and institutions who share their insights and findings on various topics related to bird biology, ecology, behavior, conservation, and education. The webinars are free and open to members. The webinars are also recorded and uploaded on the IOU website and YouTube channel, where they can be accessed anytime.

The IOU provides platforms for working groups that focus on specific topics and are led by experts in their field and specialists. The working groups aim to support, promote, and advance avian biology by reaching out to ornithologists, conservationists, policy makers, non-governmental organizations, educators, and other stakeholders. Some of the current working groups are:

• Avian Checklists: This working group produces and maintains an open-access global checklist of bird species and subspecies based on rigorous taxonomic principles and transparent decision-making processes.
• Avian Morphology: This working group fosters collaboration and communication among researchers who study the form and function of birds, including anatomy, physiology, biomechanics, development, and evolution.
• Bird Marking: This working group promotes the use of standardized methods and best practices for marking birds for scientific and conservation purposes.
• Birds as Peacemakers: This working group explores the potential of birds as catalysts for peace-building and conflict resolution in regions affected by violence and instability.
• Ethics in Ornithology: This working group develops and disseminates ethical guidelines for ornithological research, education, and outreach.
• Psittaciformes: This working group addresses the conservation challenges and research needs of parrots, one of the most threatened groups of birds in the world.
• Gondwanan Ornithology: This working group facilitates collaboration and exchange among ornithologists from the southern continents that were once part of Gondwana, such as Africa, South America, Australia, Antarctica, and India.

• Cornell Lab of Ornithology
• American Ornithological Society
• British Ornithologists' Union

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