Self-reflexive documentaries follow people around with their knowledge that they are being filmed, and the subjects may stop to speak to the camera. Docudramas feature dramatized reenactments of real events. Fly on the wall documentaries involve an unobtrusive camera crew and commonly include interviews of the subjects. Docusoaps film people in a particular job or location over time and can be impacted by subjects changing behavior due to being filmed. Fully narrated documentaries use voiceovers to provide context and explanation for visuals, often seen in nature documentaries. Mixed documentaries combine different documentary techniques like interviews and archival footage.