I happened along at the right time this morning to witness quite a battle for a nesting box between a pair of Violet-green Swallows and an intruding male House Sparrow. I set this nesting box up earlier this year just outside of The Lodge where we live in at the Dallas Retirement Village hoping to attract swallows. This box has a specifically designed narrow opening that will allow swallows to enter, but too small for the heftier House Sparrows to enter. For several day now the Violet-green Swallows have been hanging around this nesting box, and in fact this morning I saw the male collecting nesting material.
a male House Sparrow inspecting the nesting box
He drops down for for a closer look