Konrad Lorenz was an Austrian pioneering ethologist, zoologist, and writer. Unlike psychologists, who studied animal behavior in laboratories, Lorenz studied animals in their natural habitats. He observed that instinct played a major role in animal behavior – for example, in imprinting, by which an animal may learn to identify its parents. Some of his views are expressed in his book On Aggression (1966); an early well-known book is King Solomon's Ring (1952). He shared, with Nikolaas Tinbergen and Karl von Frisch, the 1973 Nobel Prize in Physiology or Medicine.