144:). Through her observations, she noted butterflies' preference for blue, crimson, and violet flowers. Ilse's research proved that butterflies have a sense of color, and that most butterflies discover flowers on their first approach through their color and scent. Her experiments also showed that butterflies, like other insects, can be trained.
94:. However, the discriminatory law “On the Restoration of the Civil Service,” of 7 April 1933 prevented her from doing so on account of her Jewish origins. Ilse instead took up a position as an assistant at the Zoological Institute, alongside which she undertook unpaid work producing educational films. In 1935 she moved in exile to
82:. From there she relocated to Bonn to work as a Scientific Assistant at the hereditary biological archive in Bonn. She returned to Berlin in 1931, as a Scientific Guest Researcher at the
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277:"Dora Ilse: The Senses of Butterflies"
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