This is my first instructable! Anyway, I recently moved into a new apartment and having a background in animal behavior, I wanted a bird feeder. But! No matter where I seemed to hang it from, the squirrels were able to jump to it and knock down most of the seeds or break the feeder. They would climb onto the window ledge pictured here and jump at the feeder to knock seeds onto the porch. So this is my solution:
Step 1: Monofilament line
First, this instructable is for deterring squirrels from jumping, not necessarily for preventing any kind of climbing. It also assumes your feeder is hung from some overhanging structure. That being said...
1.) Attain monofilament/fishing line:
Tend to the thinner side as it will be less likely to deter birds as well as limiting an obstructed view of your feeder.
2.) Cut the line to the height of your structure (porch, etc.) and attach a weight of any kind on one end of each length (I used 5/16 nuts)
Step 2: Attaching lines
I am not allowed to drill into the roof of this rental property, so i attached each line to the overhanging roof with duct tape...making sure to leave an excess of about 4 inches out the other side of the attached tape. Make sure to align the weights with eachother, as this will limit tangles. My weights were about 2 feet off the floor.
REMEMBER: It is worth stating you should not put these anywhere a bird could become entangled. Therefore, these should only be used on one, maybe two sides of your feeder. Use your own discretion.