Animals are great for signaling. Hunting season has started here in Texas and have spent every weekend in the woods with my kids. It has been so much fun teaching them what the different animal alerts are, teaching them how to identify tracks and maybe what the animal was doing when they made the track. One tid bit i have not seen mentioned in this thread is cows. If you are going to hunt or fish look at some cows before you go. If they are all bedded down you will not have good luck that day. I believe it is because they feel the barometric pressure change and bed down. If they are mostly up you will have better luck. You may not do well every time they are up but i have NEVER had good luck when the cows were down.