Austrian zoologist, ornithologist, and recipient of the Nobel Prize in Physiology or Medicine who pioneered the modern study of animal behavior (1903–1989). Collection of eight untranslated TLSs in German, four signed “Konrad Lorenz” and four signed “K. Lorenz,” each one page, most on Max Planck Institute letterhead, dated between 1951 and 1969. Several are written to fellow ornithologists Rudolf Kuhk and Ernst Schuz. One describes an experiment with greylag geese, in part (translated): “We suffer from an increasing overpopulation with gray geese, which comes about through that young couples moving in spring to breed in nearby lakes and return in autumn with their children, hoping that we will feed them through the winter. This…disrupts our observations, because the young non-ringed geese…hinder the overview of our experimental animals. Dr. Fischer now had the brilliant idea to the following experiment: We transported 40 geese to Lake Neusiedl, and left them there, free to a point where a lot of gray geese were. We hoped that our geese would join the many wild ones, follow them on the migration route down the Danube and perhaps come back at least partly in the spring.” In overall fine condition. Also accompanied by an unsigned typed letter by Lorenz and an event program. Pre-certified PSA/DNA.
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