Comma

Another lovely warm spring lunchtime. I've now seen three more kinds of butterfly as well as the peacock I blipped recently: a small tortoiseshell, a brimstone, and today two or three commas.

It gets its name from the small white punctuation mark on the underside of the wing, not visible here. These early spring ones have overwintered in the adult state (unlike most butterflies which overwinter as eggs, caterpillars or chrysalids) but the crinkly edges to the wings aren't due to old age - that is how they are.