I am sorry, but I would put tons of money on this, more monitors are eaten, killed by conspecifics then by other species. Do you care to bet?
I know, you are going to say, but not many people put two different species together. But that does not explain why members of the same species eat eachother.
Well the answer is very simple, monitors in my experience, do not eat eachother, except, let me say, EXCEPT, when they are starving. Then they will indeed eat anything. This I have mentioned many times. Before you go about saying this and that about cannibulism, you must first understand, the difference between monitors being hungry, really hungry and starving. A starving monitor will indeed eat anything.
Unfortunately, this is not understood by many. If you keep a healthy hungry monitor hot and not feed it for over three days, you better expect a healthy monitor to be very dangerous to others. Normally, in nature they feed when hungry. If for some reason there is no food to be found, then survival mode is dictated. Humans have done the same. F