- Mourning Cloak Butterfly includes a few images that illustrates its life cycle. We often see them early in the spring because they overwinter as adults.
- Sap from the trees that Red-breasted Sapsuckers drill wells in may be quite important as an early season food for these butterflies before flowers begin to bloom.
- For information as to how various creatures such as the Mourning Cloak Butterfly can overwinter look at To Freeze or Not To Freeze by Bob Armstrong and Marge Hermans
