page_title: Timeline of ornithology
section_title: 1900–1950
hierarchical_section_title: Timeline of ornithology / 1900–1950
caption_attribution_description: Bright-headed Cisticola (Yellow-headed Fan-tailed Warbler) Cisticola exilis tytleri Jerdon
context_page_description: The following is a timeline of ornithology events:
context_section_description: 1900 – Ernst Hartert monographs the Trochilidae in volume 9 of the series Das Tierreich (the Animal Kingdom) published in Berlin by R. Friedländer und Sohn
  1900 – Edmond de Sélys Longchamps bird collection given to the Royal Belgian Institute of Natural Sciences
  1900 – National Audubon Society organises the first Christmas Bird Count
  1901 – Johannes Thienemann establishes Rossitten Bird Observatory, the world's first bird observatory
  1901 – The Royal Australasian Ornithologists Union established
  1902 – Wild Birds Protection Act 1902
  1905 – Foundation of the National Audubon Society
  1905 – Philogène Auguste Galilée Wytsman commences the serial publications Genera Avium
  1905 – Joseph Whitaker publishes The Birds of Tunisia
  1905–1906 – Bror Yngve Sjöstedt Wissenschaftliche Ergebnisse der Schwedischen Zoologischen Expedition nach dem Kilimandjaro, dem Meru und umgebenden Massaisteppen Deutsch-Ostafrikas.
  1907 – The monthly journal British Birds begins publication
  1907 – Kurt Floericke  becomes the editor of  Kosmos – Die Zeitschrift für alle Freunde der Natur or Magazine for the Friends of Nature
  1909 – First organised ringing schemes in the UK
  1909 – Heligoland Bird Observatory is established on Heligoland by Hugo Weigold. Birds are collected in specially designed wire-netting traps, still known today as "Heligoland traps"
  1909 – First known mapping census carried out in Kent, England by the Alexander brothers
  1909 Ornithologists James Chapin and Herbert Lang begin a six-year biological survey of the Belgian Congo.
  1910–1911 – Sandy Wollaston leads the British Ornithological Union Expedition to Dutch New Guinea
  1910 – Museum Oologicum R. Kreuger commenced by Ragnar Kreuger
  1910–1913 – Edward Adrian Wilson is the zoologist on the Terra Nova Expedition. He died with the rest of the party but in 1987 Edward Wilson's Birds of the Antarctic was edited by Brian Roberts and posthumously published
  1912 – A barn swallow ringed by James Masefield in Staffordshire, England is recovered in Natal, South Africa
  1912 – Giacomo Damiani and Conte Arrigoni degli Oddi Birds of the  Tuscan Archipelago
  1914 – The last passenger pigeon dies in Cincinnati Zoo
  1914 – Emilie Snethlage publishes  Catálogo das Aves Amazônicas
  1915 – Cornell Lab of Ornithology founded
  1915 – Eduard Daniel van Oort becomes director of the Rijksmuseum of Natural History in Leiden.
  1916 – Marion Ellis Rowan paints birds on the first of many trips to New Guinea.
  1918–1949 – Carl Eduard Hellmayr ends the chaos of systematic and nomenclatural confusion created by previous ornithologists working on South American birds in Catalogue of Birds of the Americas. It takes four decades and fifteen volumes.
  1921–1932 The Whitney South Sea Expedition visits islands in the south Pacific region collecting over 40,000 bird specimens. The expedition also seals the extinction of the Guadalupe caracara
  1922 – Foundation of the International Council for Bird Preservation (now BirdLife International)
  1922 – Publication of John Charles Phillips's A Natural History of the Ducks, which provides maps of the known breeding and wintering distributions of ducks throughout the world
  1922 William Rowan tests the effect of photoperiodism on the size of gonads in birds
  1925 – Perrine Millais Moncrieff publishes a field guide New Zealand Birds and How to Identify Them.
  1927 – Frédéric Courtois publishes Les oiseaux du musée de Zi-Kia-Wei
  1928 – Ernst Mayr leads the first of three expeditions to New Guinea and the Solomon Islands, during which he discovers many new species
  1929 – Conte Arrigoni degli Oddi publishes Ornitologia Italiana.
  1929 – Friedrich von Lucanus publishes  Zugvögel und Vogelzug (Migratory birds and bird migration)
  1930 – Alexander Wetmore publishes his Systematic Classification
  1931 – Ernst Schüz and Hugo Weigold publish Atlas des Vogelzuges, the first atlas of bird migration
  1931 – Jean Théodore Delacour publishes Les Oiseaux de L'Indochine Française
  1932 – Foundation of the British Trust for Ornithology for the study of birds in Britain
  1932 –  Yoshimaro Yamashina founds the Yamashi
caption: Yellow-headed fan-tailed warbler Cisticola exilis tytleri from The Fauna of British India, including Ceylon and Burma. 2nd edition, 1924
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