Nikolaas Tinbergen was a Dutch biologist and ornithologist, born on April 15, 1907. He is best known for his pioneering work in the field of ethology, which is the study of animal behavior. Tinbergen's research focused on understanding the instinctive behaviors of animals, and he developed a framework for studying these behaviors through observation and experimentation. In 1973, Tinbergen was awarded the Nobel Prize in Physiology or Medicine, sharing it with Konrad Lorenz and Karl von Frisch. His contributions significantly advanced the understanding of animal behavior and ecology, influencing fields such as psychology and conservation. Tinbergen's legacy continues to impact research in behavioral science today.