Bok's Banging Butterflies

Butterflies lay eggs on leaves, the eggs hatch into caterpillars, and caterpillars form chrysalises before emerging as new butterflies. Players can catch butterflies with a butterfly net, store them in jars or bottles, and release them again. A caterpillar that is left on a block it cannot feed on starves, so players move them to suitable leaves by picking them up and placing them elsewhere.

Several species of butterflies and moths are included, each with its own design and behaviour. Some are larger, some fly faster, some live longer, and some are dimorphic. Their food preferences differ: some favour apples and others feed on wood fruit. A butterfly book stores information about each species, and a butterfly microscope reads scrolls so the player can collect that information in one place. Butterflies bred by players are fed their favourite flower or plant, which the butterfly book reveals after study.

The mod runs on the client and on the server, so both sides need it. It is released under the MIT License and is open source, with its source code and issue tracker publicly linked. Files cover Forge and NeoForge for seven game versions, 1.18.2 – 1.21.4, and the latest files are 7.10.9 for 1.20.2 (Forge) and 1.21.4 (NeoForge).