Track marks

So we've always had wildlife in our yard, mostly birds, rabbits, an occasional cat or two. Now we have deer. We haven't actually seen them at all, but now that there's snow everywhere, we can see their tracks all through the yard. I was wondering what was going on when everything we'd put out would be gone the next morning, now that the chipmunks are gone and aren't bringing it all home with them. We keep checking outside (and Greg was shining for them with a flashlight out our window the other night) to see if we can catch a glimpse of them, but nothing yet.