The butterfly has been in Creatures 1, 2, and 3, in many different forms. In C1, the Cloud Layer Butterfly was featured in the second object pack for the game.
Helen created both the Enchanted Butterfly and the Sugar Butterfly for C2. Both are available on this page. Many other kinds of butterflies are up for download on numerous sites.
C3 Butterfly[]
Ingame image
Official Ecology image