Comma? Why not an exclamation?

One of the (unexpected) added bonuses of bipping everyday, is that I'm learning all sorts of things I never knew before.

Today's lesson: This butterfly is called a Comma. Despite the gloriously colourful and showy wings in this photo, the other side is "craggy" looking like bark but has a single white mark on it in the shape of a comma - hence the name.

See! Every day's a school day!