On its highest sensitivity setting, something as small as a bird can trigger the Primos Truth Cam 35 wildlife camera. Generally, this is the setting that I use, although if I find that the camera is taking too many photos in which nothing of interest is seen, I might change the setting to a medium sensitivity setting. This white-tailed deer triggered the camera as soon as it entered this small clearing, gaining its attention at first, but then it ignored the camera and began eating.