What happens in the nest after Eastern Bluebird chicks were banded by a researcher

It's banding day for the two Eastern Bluebird chicks! We are placing leg bands on Eastern Bluebirds (and Tree Swallows) as part of a large study of bird reproduction as it relates to surface water pollution in the area of abandoned coal mines. The Latrobe, Pa. area where we operate has many old coal mine shafts and rainwater collects inside and then seeps out into surface streams. Dr. Kellam and his students hypothesize that the polluted water causes reduced reproduction among birds nesting nearer the pollution source compared to those nesting farther away. Fortunately, the Eastern Bluebird nest here is in the "far away" group and will likely experience no impacts from coal mine seepage!
The point of this video is to show what happens after we've banded the nestlings with numbered aluminum leg bands provided by the U.S. Fish & Wildlife Service. State and federal permits as well as approval from an ethics board are required to do this work.
So what happens? Not much! And that's a good thing! We returned the chicks to their nest and then the nestlings remained motionless while they could hear us talking outside the box. Within 35 seconds after human voices drift away (2:08), the chick on the right begins to adjust its position (2:37). They are inactive then for another 3-4 minutes before the first (female) parent arrives with food (6:43). Does she notice anything different after her nest box was opened and chicks manipulated? We don't see anything that indicates she is concerned. She leaves the box in less than a minute as her male partner arrives and feeds the second chick (7:26).