Better yet, add the ability to right-click butterfly/snail jars on in-world terrarium jars to put them inside.

It's neat that there are ambient mobs like snails/butterflies, but they spawn a ridiculous amount in Flower Island biomes, and also somewhat frequently in Mystic Groves. It'd be cool to do something with them.

I'll add a butterfly jar eventually. As for snails, nah.

I'm not going to do jar blocks for butterfly/pixie jars either. It just wouldn't look that good unless they moved around and rendered properly, and that would be way, way too complicated.

Added butterfly jars so you can catch/release them as you please