I have video of my cuddeback no flash, and the deer seem very inquisitive like they can see it in the dark/night like a flash, even though there is no flash, makes me wonder if it's a marketing scheme, can deer see infered? in a sense IR is just a color we humans can't see, just like deer can't see red we can't see IR. Though I wonder if they can hear some unusual sounds from the camera, no matter how slight.