This kind of symmetry is called reflective symmetry. It's not just in butterfly wings that you can see reflective symmetry, have a look through the slideshow below to see some other examples.

Hannah and Maya meet Angela, who teaches them about reflective symmetry in the world around them. Part of The Regenerators teachers' video collection.

These can be found in the center of a sunflower, a snail’s shell, the base of an unopened pinecone, and seen as a fern just begins to unfurl its leaves. On a larger scale, this symmetry in nature can ...