Sparrow Sombrero blocks invasive house sparrows
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Deter invasive house sparrows from dominating bird feeders.
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Model information
- Source
- Printables
- Category
- Outdoor & Garden
- License
- Creative Commons — Attribution — Noncommercial — Share Alike
Background
We're working on enhancing our yard for those wonderful little Black Capped (or Mountain) Chickadees. I previously created a large feeder and then a smaller one. There was even a barrier for standard feeders and an early version of a modular feeder . In each case the piggy house sparrows figured out a way to monopolize the feeders and chase away the smaller chickadees. House sparrows are an invasive species in our area.
Design
Time to take more drastic action. Based upon other ideas for deterring house sparrows, this is an eight armed spoke where fishing line is attached to each spoke and terminated with a lead sinker (weight). The device is designed to be used in conjunction with either the large or small chickadee feeder.
Printing
Nothing special about printing, I used Polymaker PETG, .4 nozzle, .25 layers, 30% gyroid infill on an OPXL5H.
Assembly
The vertical post is designed to fit over the post on either the large or small feeder listed above. It is held in place with a pin. I used small carabiners to hang the assembly from a pergola. I used 50lb fishing line (for greater reflectivity) and 3/8oz lead sinkers. ymmv. I used long lines to deter sparrows from flying up from under the assembly.