A way of keeping track of when you wacked it. And since there is money involved,, "The ties are used with a "Kill Block". They give them out for contests labeled one to how ever you want to give the hunters with zip ties. then after killing your first coyote, you write the time on the block and zip tie it in the coyote's mouth. then when they turn in the coyotes at the end of the contest, they check the coyotes body temp. the number should correlates with the temp of the coyote's body to keep people from cheating." I have never seen it done but I can imagine. I wouldn't want the job of checking the body temp.