There are many ozzie books on monitors, they have discriptions in them. Study them. Study the differences. Some are mislabeled. There are also many other monitor books with discriptions, but the ozzie books have better locals. Which is key.

Look at range maps, and plot the pics by locality.

The above will start to give you an idea. Then compare nare openings, ear openings, head shape, the ridge running down the top of the tail. At this time forget about the color and pattern. Study these differences.

Also study V.panoptes. As they are also related and included in the crosses.

After that, we can talk. Thanks FR

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