I've been to the butterfly house at the zoo many times, and I've never heard it called a lepidoptery, however it seems like it would qualify as a terrarium. Is this right?
It has the double door system at the entrance and the exit, and when you walk inside it you feel like you have entered a completely different climate. It's actually one of my favorite places. I had never thought of it as a terrarium though. I didn't realize they could be so big!