So with some old CDs and a bit of creative savvy I made a few bird deterrents. Initially I wanted to purchase one of those reflective bird pyramids, but after seeing the price and surviving a minor heart attack – I decided to create my own based on the same principle.
So birds' visual colour - and light spectrums are different to humans. Humans can see in the 400-750nm wavelength range (the visual light range, indicated on the figure below). Our range has a normalised bell curve (the purple curve on the left side of the figure below) and our optimum colour range peaks at 555nm (which is green). Whereas birds have three optimum range peaks, one at green (508m), blue (445nm) and red (565nm). This makes birds more sensitive to these colours, red being the most prominent. By incorporating red and reflective surfaces into your bird deterrent devices will make your garden a literal eye-sore to birds and they will avoid landing close by.
DIY Bird deterrents, front (left) and back (right) hung from tomato stakes. Now the tomatoes and chicken pellets can be spared!
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