Chimney Swifts return to Wisconsin in mid-to-late April from their wintering grounds in South America. If you’re lucky, the returning swifts will use your home or workplace chimney as a roost during migration or as a nesting site this spring and summer.
To avoid disturbing roosting or nesting swifts, it is important that you avoid having your uncapped chimney cleaned for the period of mid-April through mid-October.
Chimney Swift populations are declining for reasons that are not yet fully understood, so the swifts need our help! For more information about welcoming swifts to your chimney, and being a good “swift landlord,” please see https://www.wiswifts.org/wp-content/uploads/2018/07/WICHSW_flyer_final.pdf.
What is a Chimney Swift?
This small bird spends almost its entire life in flight, feeding and drinking on the wing. Chimney Swifts nest and root in chimneys and on vertical surfaces in dim, enclosed spaces. On migration in spring and fall, swifts can be seen at dusk swirling into large chimneys by the dozens or even thousands to roost for the night.
- Chimney Swifts have declined significantly in recent decades and need our assistance more than ever. In 2009, our northern neighbor, Canada, listed them as Threatened.
- Because of changes made to our landscape and loss of historical habitat, swifts rely almost entirely on man-made structures for nest and roost sites. Our chimneys are their homes.
- Chimney Swifts eat up to half of their own weight in flying insects, including pests, every day.
- Chimney Swifts are protected by Federal law under the Migratory Bird Treaty Act of 1916.
- Like watching a beautiful sunset, the aesthetic value of observing Chimney Swifts’ aerial acrobatics and interactions is a simple pleasure of nature.
- If you have a masonry or clay flue-tile chimney, keep the top open and the damper closed from April through October to provide a nest site for these insect-eaters. Metal chimneys should be permanently capped to prevent birds and other wildlife from being trapped.
- If you have your chimney cleaned, do it from November to March before the Chimney Swifts return from their winter home in South America.
To find out how you can help this amazing species, visit this page.