Right now a lot of birds are on the move since we are just beginning the fall migration. Chimney Swifts are no exception and they display a behavior which is fun to watch. Swifts look like little torpedos with fluttery wings, thus the nickname ‘flying cigars.’ Their wings move quite fast and the birds emit a high-pitched chattering while flying over your head. You probably have seen them and not known it because they tend to hang out with swallows. During migration, thousands of swifts roost together in chimneys, funneling into them at dusk.
To get a sense of how many are migrating, Audubon asks bird clubs and bird groups to conduct a count in their area. There is worry that the Swift population is diminishing because more chimneys are being capped or just removed because they are no longer in use. Our count was on August 8th and the chimney we watched became the overnight roost for 86 swifts. Other watchers got less than ten or none but a few got anywhere from 200-300.
This week one of our local birders reported seeing 2000 chimney swifts going into a large local chimney at the St. Norbert’s Abbey in De Pere, Wisconsin. I had a dinner engagement on the evening following this report so I decided to drive over after dinner to see if the swifts were still around. They were. There was another birder there and between the two of us we counted at least 2500 chimney swifts.
The next night I said to Curt, “Let’s go find some swifts.” And this time I took the camera.
When we got to The Abbey the sky was full of birds. (note: click on the picture to get a larger view)
They swirled in a clockwise direction. Around and around. The sun set at 7:33pm but they still kept flying. Then about 7:45pm they started dropping into the chimney.
These pictures were taken in just the first minute. The birds continued to go into the chimney and in another minute or two the sky was empty. I think we once again had 2000 – 3000 birds. They will roost there overnight clinging to the vertical masonry. The next day will be spent foraging. They may roost again in this chimney or move on, eventually ending up in South America for the winter. It was a wonderful and amazing sight.
Answer. We carefully counted 175 birds in just this small section of the sky