Taronga raises mealworms, crickets, woodies, yabbies, maggots and others in the heated half of a building known officially as the "Food Production Unit" but informally called "the bug house". The other, air-conditioned, half of the building is for raising rats and mice as food for animals. I am not sure of the exact condition of their housing or similar (due to my current volunteer position I have not yet been in there - although that will likely change in a few months time!)