Carolina wrens do not migrate but are very sensitive to cold weather. Severe winters result in a marked decline in their numbers. Having a known source of food is essential for providing wrens with the energy, stamina, and nutrition they need to survive. For this reason, it is a good idea to put out a feeder to help these birds (and other bird species as well) survive the winter.
Carolina Wrens are primarily insect eaters, but suet, peanuts, and mealworms are good substitutes for scarce insects during winter. They can be attracted to your feeders by providing a brush pile close to your feeding area. They feel more secure with a place to seek refuge nearby.
A good idea to encourage Carolina wrens to stay and feed in or near your yard is to provide roosting pockets near the bird feeders. Roosting pockets are little shelters, much like birdhouses (but smaller and not meant to be used as a nesting site), where the birds can roost and hide from the wind chill. The combination of roosting pockets and bird feeders during winter is one sure way to attract Carolina wrens in your area
Carolina Wrens will lay 2 broods in the nesting season (typically April to July). The male House Wren builds several nests and the female chooses which nest she prefers. The other nests may be used by the male to discourage other male wrens from nesting in the same territory. Carolina wrens do not only pair during breeding season but form bonds for life and engage in activities together year round.
A group of wrens has many collective nouns, including a "chime", "flight", "flock", and "herd" of wrens.