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Jean Théodore Delacour was an American ornithologist and aviculturalist of French origin. He was renowned for not only discovering but also rearing some of the rarest birds in the world. He established very successful aviaries twice in his life, stocked with birds from around the world, including those that he obtained on expeditions to Southeast Asia, Africa and South America. His first aviary in Villers-Bretonneux was destroyed in the First World War, and the second one that he established at Clères was destroyed in the Second World War. He moved to the United States of America where he worked on avian systematics and was one of the founders of the International Committee for Bird Protection (later BirdLife International). One of the birds he discovered was the imperial pheasant, later identified as a hybrid between the Vietnamese pheasant and the silver pheasant

Richard Bowdler Sharpe was an English zoologist and ornithologist who worked as curator of the bird collection at the British Museum of Natural History. In the course of his career he published several monographs on bird groups and produced a multi-volume catalogue of the specimens in the collection of the museum. He described many new species of bird and also has had species named in his honour by other ornithologists including Sharpe's longclaw (macronyx sharpei) and Sharpe's starling (poeopters sharpii). He was Clerk in Charge of the Library at the Zoological Society of London 1867-1872. Sharpe founded the British Ornithologists' Club in 1882 and edited its bulletin. He was a Fellow of the Zoological Society of London and the Linnean Society

Konrad Zacharias Lorenz was an Austrian zoologist, ethologist and ornithologist. He shared the 1973 Nobel Prize in Physiology or Medicine with Nikolaas Tinbergen and Karl von Frisch. He is often regarded as one of the founders of modern ethology, the study of animal behaviour. He developed an approach that began with an earlier generation, including his teacher Oskar Heinroth. Lorenz studied instinctive behaviour in animals, especially in greylag geese and jackdaws. Working with geese, he investigated the principle of imprinting. Although Lorenz did not discover the topic, he became widely known for his descriptions of imprinting as an instinctive bond. Lorenz's work was interrupted by the onset of World War II and in 1941 he was recruited into the German Army as a medic. In 1944, he was sent to the Eastern Front where he was captured by the Soviet Red Army and spent four years as a German Prisoner of War in Soviet Armenia. Lorenz wrote numerous books, some of which, such as King Solomon's Ring, On Aggression, and Man Meets Dog, became popular reading