Hmmmmmmmm, thats the easy part and the hard part. Lets start with, all monitors have a sequence of behaviors and events. From hatching to old adult and all the normal things in the middle. My job is to progress them thru the events. Once you have done that a few times, you know what to expect. If anything is out of the sequence, then that requires attention.
Thats why I recomend keepers who are serious about breeding monitors to start with ackies. They will pull you thru events in order. Then when you see that, you can apply that to other monitors. All monitors go thru the same events in the same order. They start as a hatching, then subadult, then adult, then post-reproductive. Each of these has stages within them.
The problem with WC's is they do not have their events in order. Its all screwed up. You as a keeper, are required to realign them and get them progressing in proper order.
For instance, you have a single water, i believe. At some future date, you may introduce a potential mate. When you do, you have no idea a what stage they are at. Or are they at the same stage. You can see almost anything, males breeding males, females breeding males, anyone killing anyone. One may want to pick a mate and breed, but the other may still want out(a ticket back to indo)
I hope that sounds confusing, cause it is. But if you started with babies and kept them together since they were young. By the time they are adults, you have already worked out the getting along part. Which is the start of the next step in the sequence. Adults not getting along is not a pretty sight.
I feel its very very important to socialize the monitors. That is, have them know how to get along with eachother. I could careless if they do or do not in nature, they need to here, or we have hamburger in our cages. We have to have them get along because they are in cages.(the part somebody does not get) Funny part is, they are prone to get along, Its not like asking them something they do not want to do. Once monitors pair up, its heartbreaking to take them apart. For instance, when Georges mate died, he was depressed for months and has never returned to his former self.
I will ask you, what has a better chance of producing offspring, monitors that get along, or ones that do not? Thats easy huh? Sorry I rant.
Experience teachs you what to look for, for me, its in the eyes, monitors express thru their eyes. I believe I said that, in those interviews. If monitors do not have fire in their eyes, then they are not monitors. Maybe Sam would agree with me on that. IF they lose the fire, somethings wrong. Enough for now, back to work with the monitors, FR