Popular science features on wildlife typically capture camera images using natural light, or high-speed exposures. This is not possible where the ambient light is extremely poor. E.g. Caves, Undersea
For beings accustomed to the stygian dark, the high illumination for a video camera and/or the flash of a still camera could both be the equivalent of a 1" spanner wallop on the head or worse. Do we, inadvertently, injure the local ecosystem this way?