Toby_H said:Since you live in Iowa, I assume this is a summer enclosure only...
I live in Charlotte North Carolina and I keep my Tegu outdoors from May ~ September. His "hidebox" is simply his hatchling cage with the door open. It is a 4' x 2' @ 2' tall enclosure with 8" of mulch in the bottom placed in a shady part of his enclosure. This si where he sleeps at night and where he burries himself to hide from the hottest part of our hotter summer days.
If I owned my home and was building a permanent enclosure I would surely have a burried hide of some sort.
Though, I believe variety is the spice of life. So I attempt to provide my Tegu with options, then monitor him to see which options he tends to prefer in different situations/conditions. So it is likely, that in an "ideal" outdoor enclosure, he would have both aboveground and underground hides. Also he would have both open space hides and tight quarter hides.
A burried hide will surely be cooler than an aboveground hide. So those who live in hotter climates will have more of a need for underground hides giving the Tegu a place to escape the hottest part of the summer days. But those in cooler climates where the heat of the summer days are more tame, this is much less critical.