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Published on Mar 17, 2016
This video taken with an in-box camera shows a resident female Tree Swallow successfully defending nest box against an intruder unfortunate enough to be caught inside the box. It is quite violent and disturbing to watch, but the intruder survives. This behavior is also seen in bluebirds, wrens, chickadees and other cavity nester which compete for nest cavities they can't make themselves.