When you watch dogs play in the park or watch how your professors conduct their classes, you are engaging in a form of naturalistic observation.
Explanation:
The observation that does not require an application of artificial efforts to concentrate and happens easily can be termed as naturalistic observation. There are instances in which we get engaged spontaneously.
It happens without even consciously knowing that our brain has started paying attention to the happening in front of us. This is nothing but a naturalistic observation.