How do they get under the MHP?
I think you may be seeing it wrong. We're looking at the side. The front is to the left, with the chick's head poking out (in the first picture).
Yes! Thanks, Nathan, for helping answer that for me

I turned the cave to the left because the back wall of the dog crate can be opened and I can reach it better this way for helping them in the first few nights.
Tonight I did have to put them in again (night #2), but they spilled out in a pile half in and half out so it must be a little too warm. It's currently 74 degrees here in Dallas and the lows this week will be in the 60s. For now they're in a cool garage (it won't get hot in there until hottest summer days and they're out of the wind for now...our coop is very open air for the summer heat and the deep litter hasn't been going long enough this time to get warm...soon!). I'll watch them tomorrow and probably turn it down if they mostly hang out on top.
