Containing a real tarsal gland submerged in pure buck urine, Code Blue's tarsal gland leaves a potent scent trail that signals to mature bucks that another dominant buck is in the area. tarsal glands, found on the hind legs of deer, secrete a musk deer use to identify other deer and learn their status. Every deer has a unique rutting odor, typically deposited in scrapes when the buck rub-urinates during the peak rut. Code Blue has captured that unique rutting odor in every bottle of Code Blue Tarsal gland.