May 5 update

This lovely Violet Green Swallow nest is safe from House Sparrow attacks. The box is nearby our Bluebird boxes and had previously been taken over by House Sparrows, increasing the population of these aggressive and invasive birds. A hole reducer has been added that excludes the House Sparrows, keeping this sweet nesting pair safe. Lowering the House Sparrow population will also add to the long term safety of our Western Bluebirds.

2 thoughts on “May 5 update

  1. Oval holes that are 7/8″ high and 1.5″ wide will exclude House Sparrows. These holes will allow Violet-Green Swallows to use the boxes but will discourage a number of other species as well. If you know that there are Violet-Greens in your area I would say this is a great option. If you don’t, you may want to choose a round hole that is 1 and 1/8″ in diameter to encourage chickadees and wrens to nest in safety from House Sparrows. We are experimenting with a slightly larger oval hole to see if we can accommodate the Tree Swallows that are competing with House Sparrows in our area. I will be sure to let you know if we are successful!


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