Thorleif Schjelderup-Ebbe Thorleif Schjelderup-Ebbe was a Norwegian zoologist and comparative psychologist .Career Thorleif Schjelderup-Ebbe described the pecking order of hens in his PhD dissertation of 1921. The work in his dissertation was partly based on his observations of his own chickens that he had recorded since the age of 10. The dominance hierarchy of chickens and other birds that he studied led him to the observation that these birds had established the order in which individuals would be allowed to get to food while others would have to wait for their turn.Personal life He was the son of sculptors Axel Emil Ebbe and Menga Schjelderup. He was married to Torbjørg Brekke. Their son was Dag Schjelderup-Ebbe , a musicologist, composer, music critic and biographer.Publications Hønsenes stemme. Bidrag til hønsenes psykologi, in: Naturen: populærvitenskapeling tidsskrift 37, 1913, 262-276 Kometen: mytisk roman, Kristiania 1917 Beiträge zur Biologie und Sozial- und Individualpsychologie bei Gallus domesticus , Greifswald 1921 Gallus domesticus in seinem täglichen Leben, Dissertation Universität Greifswald , 12. Mai 1921 Beiträge zur Sozialpsychologie des Haushuhns, in: Zeitschrift für Psychologie 88, 1922, 225-252 Soziale Verhältnisse bei Vögeln, in: Zeitschrift für Psychologie 90, 1922, 106-107 Aufmerksamkeit bei Mücken und Fliegen, in: Zeitschrift für Psychologie 93, 1923, 281-282 Digte, Kristiania 1923 Der Graupapagei in der Gefangenschaft, in: Psychologische Forschung 3, 1923, 9-11 Das Leben der Wildente in der Zeit der Paarung, in: Psychologische Forschung 3, 1923, 12-17 Tanker og aforismer, Kristiania 1923 Weitere Beiträge zur Sozialpsychologie des Haushuhns, in: Zeitschrift für Psychologie 92, 1923, 60-87 Les Despotisme chez les oiseaux, in: Bulletin de l'Institut Général Psychologique 24, 1924, 1-74 Fortgesetzte biologische Beobachtungen bei Gallus domesticus, in: Psychologische Forschung 5, 1924, 343-355 Kurzgefaßte norwegische Grammatik, Teil 1: Lautlehre, Berlin 1924 Poppelnatten: digte, Kristiania 1924 Zur Sozialpsychologie der Vögel, in: Zeitschrift für Psychologie 95, 1924, 36-84 Det nye eventyr: digte, Oslo 1925 Soziale Verhältnisse bei Säugetieren, in: Zeitschrift für Psychologie 97, 1925, 145 Zur Theorie der Mengenlehre, in: Annalen der Philosophie und philosophischen Kritik 5, 1925/1926, 325-328 Blaat og rødt: digte, Oslo 1926 Der Kontrast auf dem Gebiete des Licht- und Farbensinnes, in: Neue Psychologische Studien 2, 1926, 61-126 Sociale tilstande hos utvalgte inferiore vesner, in: Arkiv för psykologi och pedagogik 5, 1926, 105-220 Organismen und Anorganismen, in: Annalen der Philosophie und philosophischen Kritik 6 , 1927, 294-296 Fra billenes verden, Oslo 1928 Overhöihetsformer i den menneskelige sociologi, in: Arkiv för Psykologi och Pedagogik 8, 1929, 53-100 Zur Psychologie der Zahleneindrücke, in: Kwartalnik Psychologiczny 1, 1930, 365-380 Psychologische Beobachtungen an Vögeln, in: Zeitschrift für Angewandte Psychologie 35, 1930, 362-366 Die Despotie im sozialen Leben der Vögel, in: Richard Thurnwald , Forschungen zur Völkerpsychologie und Soziologie 10, 1931, 77-137 Farben-, Helligkeits-, und Sättigungskontraste bei mitteleuropäischen Käfern, in: Archiv für die Gesamte Psychologie 78, 1931, 571-573 Liljene på marken, Oslo 1931 Soziale Eigentümlichkeiten bei Hühnern, in: Kwartalnik Psychologiczny 2, 1931, 206-212 Instinkte und Reaktionen bei Pfauen und Truthühnern, in: Kwartalnik Psychologiczny 3, 1932, 204-207 Social behavior of birds , in: Carl Murchison , A Handbook of Social Psychology , Worcester 1935, 947-972 Über die Lebensfähigkeit alter Samen, Oslo 1936 Sanger og strofer, Oslo 1949 Hva verden sier: en lyrisk, satirisk og virkelighetstro diktsyklus, Oslo 1953 Liv, reaksjoner og sociologi hos en flerhet insekter, Oslo 1953 Glansen og det skjulte: lyrikk, humor og satire , Oslo 1955 Høider og dybder: lyrikk, humor og satire, Oslo 1957 Life, reactions, and sociology in a number of insects, in: The Journal of Social Psychology , 46, 1957, 287-292 Sozialpsychologische Analogien bei Menschen und Tier, in: Deutsche Gesellschaft für Psychologie, Bericht über den 22. Kongress der Deutschen Gesellschaft für Psychologie in Heidbelberg 1959, Göttingen 1960, 237-249 Sol og skygge: aforismer og tanker, Oslo 1965 Av livets saga: tanker, vers og shortstories, Oslo 1966-1969 Noen nyere undersøkelser om estetikk, særlig m.h.t. diktning og folklore, Oslo 1967
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