I would theorize the larger hole is to allow air around the eggs instead of wet soil. As I mentioned, when the is dry, they bury the eggs and collaspe the cave and tunnels.

To think its about the dirt is not understanding monitors. They can dig in very very very hard dirt. This stuff is soft(for them)

When I first started with monitors, I used my skid steer to fill the cages with our natural desert soil. The monitors loved it, it was full of rocks and boulders. They would burrow all around that stuff, no problems. In fact, I think roots, rocks and such in nature are used to make it difficult for predators to get to them. Back to here, it worked, it killed me trying to dig up the eggs. So now I use soft stuff, not for them, but for my little fingers. Its desert dirt. Heck if I know a name for it. Cheers

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