Animals usually hide in dense vegetation during the day. They only venture out an hour after sunset, when we humans can barely see anything. With a sky in the background, however, they can be made visible with a long exposure time by a camera. Animals usually hide in dense vegetation during the day. They only venture out an hour after sunset, when we humans can barely see anything. With a sky in the background, however, they can be made visible with a long exposure time by a camera.