Invertebrates
Eastern Comma
Polygonia comma · also called comma butterfly
A butterfly resting on a tree trunk with its wings folded looks exactly like a dry, curled dead leaf, and only a close look at the small silver mark on its hindwing, a simple comma rather than a full question mark, reveals which of two nearly identical species this actually is.
Overview
The eastern comma, Polygonia comma, is native to forest and woodland edge habitat across a broad range of eastern North America. Its subtle comma-shaped underwing marking, convincing dead-leaf camouflage at rest, and unusual adult diet of sap, fruit, and dung rather than flower nectar make it one of the more visually and behaviourally distinctive butterflies in eastern forests.
A single punctuation mark tells two species apart
Sharing nearly everything else in common with its close relative the question mark butterfly, the eastern comma is set apart by one small detail alone, a simplified silver marking that gives the species its own distinct name.
Status
Least Concern — widespread and stable across suitable forest habitat throughout eastern North America.
Eastern Comma: common questions
How can you tell an eastern comma from a question mark butterfly?
The clearest difference is the small silver marking on the underside of the hindwing, which is shaped like a simple comma on this species rather than the curved dash paired with a separate dot that forms an actual question mark shape on its close relative, a subtle detail that requires a good look at a resting, wings-closed butterfly to confirm.
Why does the eastern comma look like a dead leaf at rest?
With its wings closed, this species closely resembles a dry, curled dead leaf in both shape and colouration, an effective camouflage strategy that helps it blend into leaf litter or tree bark and avoid detection by predators while resting motionless between flights.
What does the adult eastern comma eat?
Unlike many butterflies that rely mainly on flower nectar, the adult eastern comma more commonly feeds on tree sap, rotting fruit, and even animal dung, a diet shared with several closely related anglewing butterflies and one that provides different nutritional resources than nectar alone.
How does the eastern comma survive winter?
This species overwinters as a fully formed adult butterfly, finding shelter in protected spots such as tree bark crevices rather than migrating to a warmer climate or dying off at the end of the season, allowing it to emerge again and resume activity as soon as temperatures warm sufficiently in spring.