In the seventies I took an old aquarium, filled it with plants and put a slab of glass on top for a coffee table. The kids caught a toad and put it in. Then they felt the need to catch insects for it to eat. It was fun for them. Drew the line when they added a small garden snake. (I had taught the girls how to pick em up and remove from area ....not intending that they move them to area....it wasn’t the last one they brought in).