There are so many different opinions on this that it is hard to really say what is and isnt.I have heard that both does and bucks clump depending on what they eat.I have always been led to believe that does are pellets and bucks clump.So to be truthful I really cant answer this.I would like to find out the truth to this myself.In the past I have found that where I know the bucks to be hanging out I see the clumped terds.