Naturalistic observation is a research method that involves observing behaviors or phenomena in their natural environment without manipulation. Its origins date back to the late 19th century with scientists like Darwin and William James who emphasized studying behaviors in context. There are various types of naturalistic observation including structured versus unstructured, and participant versus non-participant observation. Examples of its application include Jane Goodall's seminal research on chimpanzees in Tanzania which provided insights into their tool use, social hierarchies, communication, and hunting behaviors. Key data collection techniques involve maintaining objectivity through approaches like participant observation, structured observation scales, and systematic recording of predefined behaviors.