This is a common problem. The bird sees the reflection and thinks it is another bird encroaching on his territory. One solution is to put a silhouette of a hawk in the window. That scares them off.
Bird band information is an important tool that is used to monitor populations, set hunting regulations, restore endangered species, study effects of environmental contaminants, and address such issues as Avian Influenza, bird hazards at airp
The North American Breeding Bird Survey (BBS) is a cooperative effort between the USGS and the Canadian Wildlife Service to monitor the status and trends of North American bird populations.