Developed and patented by the University of Nebraska. The "Magic Halo" itself will deter up to 86% of house sparrows from bird feeders with no affect on other species of backyard birds. Add the mono-filament lines included with your purchase to the "Magic Halo" extending them below the perches and the Magi Halo will repel up to 99% of house sparrows from the bird feeder. Extend the lines to the ground and the house sparrow will avoid feeding under the feeder as well. All hardware is included for using the Magic Halo with a variety of bird feeders including tube feeders and hopper feeders. 

The Magic Halo was developed after years of research into risk aversion and foraging habits of birds by Dr. R.J. Johnson, professor of Wildlife Biology and Extension Wildlife Specialist in the School of Natural Resources at the University of Nebraska, Lincoln. The Wild Bird Habitat Store has worked closely with Dr. Johnson and the UNL School of Natural Resources on various projects. It is not clear of the effect for the Magic Halo to deterring house sparrows from nest boxes as the research was inconclusive. However many have experienced success using the Magic Halo in conjunction with bluebird boxes.

Note From the Wild Bird Habitat Store: "TO PREVENT ENTANGLEMENT: Use 28-30 gauge wire instead of the mono-filament lines; or tie the mono-filament line to ground stakes. There have been reports of birds becoming entangled in the mono-filament lines. Wild Bird Habitat has found small gauge wire to be as effective as the mono-filament lines.