Nikolaas "Niko" Tinbergen FRS (/ˈtɪnbɜːrɡən/; Dutch: [ˈnikoːlaːs ˈnikoː ˈtɪnbɛrɣən]; 15 April 1907 – 21 December 1988) was a Dutch biologist and ornithologist who shared the 1973 Nobel Prize in Physiology or Medicine with Karl von Frisch and Konrad Lorenz for their discoveries concerning the organization and elicitation of individual and social behavior patterns in animals. He is regarded as one of the founders of modern ethology, the study of animal behavior.