Nikolaas `` Niko '' Tinbergen FRS ( 15 April 1907 - 21 December 1988 ) was a Dutch ethologist and ornithologist who shared the 1973 Nobel Prize in Physiology or Medicine with Karl von Frisch and Konrad Lorenz for their discoveries concerning organization and elicitation of individual and social behavior patterns in animals .
Nikolaas ` Niko ' Tinbergen ( 15 April 1907 - 21 December 1988 ) was a Dutch ethologist and ornithologist who shared the 1973 Nobel Prize in Physiology or Medicine with Karl von Frisch and Konrad Lorenz .