There's something exciting about finding the first fresh rub of the season. I saw mine on September 10, late in the evening. It was in a thick patch of mesquite trees, just off the shoulder of a two-track road. The mesquite was rubbed about thigh-and-waist high on a limb the size of a shovel handle. The peeled bark was a yellowish color and a broken limb, with green leaves still on it, lay under the rub. I guess it was less than 24 hours old.