Bird Feeding Tips
Tips on attracting and feeding backyard birds.
Banding – an important tool in bird study - Part II of II
From an article by renowned wild bird feeding scientist Dr. Aelred Geis (deceased) in the 1990s
“Banding sometimes helps us solve mysteries. For example, it was thought that fewer House Finches visited Washington, D.C. area feeders in winter because the birds migrated south. Through banding studies, we found that finches simply concentrate more heavily on feeders in summer than in winter. This was demonstrated in two ways. First, a large number of birds banded in summer were present at feeders in winter. In addition, we failed to receive any reports of distant recoveries.
The proportion of bird populations that dies each year is indicated by the rate of decline in band recoveries each year after banding. Most of the species we see at our feeders, like other small birds, die young. After only three years there are few, if any, recoveries. In contrast, recoveries of larger birds such as eagles are distributed over many years.
Banding studies have also been used to monitor the impact of hunting on duck and goose populations. When hunting increases the mortality rates of a species beyond its ability to reproduce, populations decline. That was the situation recently for Canada Geese on the Eastern Shore of Maryland. In areas where where hunting was less intense, populations increased. In this case, banding also indicated that the population had not simply moved. Banding plays a vital role in helping understand population changes.”