I like using electrical or water meter boxes, like the ones used on the ground by cities and counties. You could get these at places like Ferguson Waterworks or Hughes Supply or whoever supplies your local municipality. Or you can make a box out of plywood. Whatever you use, make sure it has easy access on the top usually the entire top of the box so you can carefully excavate the eggs once laid. The box length and width should be (-/+ 3”) at least 1-1/2 times as long as the snout to vent length of the iguana or bigger. I make a hole (depending on the size of the iguana) about 4-6" in diameter on the front side and the place a short length of corrugated plastic drain pipe in the hole or make some type of concave entrance out of cement. I also place a flat object or Piece of plywood on the bottom of the box so that there is a smooth stopping point when the iguana is digging. If you leave the screen bottom they may rip their nails off while trying to dig through the screen. I then fill the box 3/4 to 5/8 of the way with the sand/clay mixture and pre-dig the entrance of the box so she can get in the box and explore. I usually place the box a month before they lay eggs and water the sand in the box so it compacts enough and dryies to a normal level. The moisture of the sand should be about the same as digging in your back yard about 1 ft down (although your region may be different than mine)
In my other cages where they have a dirt floor I place a 20” x 20” concrete step stone or flat object at the corner of the cage and they usually dig their burrow under it and lay eggs.

Manny

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