Fireflies in Swamps!

In a future Swamp update (that I hope there is) apart from the announced features, it would be cool to have little fireflies, just flying in swarms. They would fly all around, they would iluminate the cold nights. Frogs would probably eat the fireflies, but there would be many, so don't worry! It would be a great way of not only lighting up the outside, but also the inside, maybe you could craft some kind of terrarium where you could place your fireflies so they give some light. I also think that they are an endangered species so adding them would be also very helpful, I once found one in my garden and I would have made anything for that little guy :) Also sorry for any spelling mistakes, English isn't my native language