During spring and fall migrations Vaux's Swifts have been using the tall chimney at Agate hall for an evening roost. How these birds know where to congregate remains a mystery. The evening spectacle when they enter the chimney is easily accessible to anyone taking the time to observe.
Natural World: Swifts at Agate Hall
![](https://npr.brightspotcdn.com/dims4/default/569a050/2147483647/strip/true/crop/1986x2482+0+0/resize/880x1100!/quality/90/?url=http%3A%2F%2Fnpr-brightspot.s3.amazonaws.com%2Flegacy%2Fsites%2Fklcc%2Ffiles%2F201404%2FSwifts_Entering_Agate_Hall_Chimney-2.jpg)
wikimedia commons