Woodpeckers In (and coming out of) Nesting Cavities

Different woodpecker species often compete for the same nesting cavity and “ownership” can change from year to year. […]

Northern Flickers With A Little Competition For The Nest Cavity

Relative size apparently makes no difference when birds are competing for nesting cavities. In this case the Northern Flickers are twelve times larger than the house wren (130 g vs 11 g). […]