Ok, admittedly I haven't had this problem recently but in the past the easiest way I've found is simply bringing putting a likeness of a predator bird on one of the corners of your fence or even less installing having a random bird call machine of either eagles or owls sounds to scare away the others. The latter option obviously would not change your fence at all, but every few minutes you would hear a bird call of some sort.
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spikes or whatever is suggested by this site:http://www.sialis.org/hosp.htm
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Try looking here, http://www.nixalite.com/flitelinepostwire.aspx this site offers a multitude of different solutions to protect your fence from birds. The options include bird netting, lining and spikes( If you change your mind). Not only that, their prices are pretty cheap for the quality and effectiveness of their products. I hope this helps, good luck with your bird problem!
Source(s):
http://www.nixalite.com/flitelinepostwire.aspx

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Just place an ornamental owl on top of the fence and that should keep most of the critters away. They even have ones that move their head and hoot.


"Motion Sensor Owl detects and scares away thieves! Its 360 degrees spinning head, glow in the dark eyes and loud "hoot" cause birds and squirrels to flee. Uses 2 AA batteries, not included. See order form for batteries. Plastic owl is 12"H."
Source(s):
http://www.nextag.com/owl-scarecrow/search-html
http://board.pets-buynow.com/Birds/Motion_Sensor_Owl

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Spray the top of the fence with fox urine. It won't alter the appearance of your fence, but the birds and other animals will be repelled by the scent of a predator. Dilute it with water since it smells terrible at full strength.

http://www.deerbusters.com/dee-2059.html - for the liquid version
http://www.zearth.com/Bird_X___SA_SMALL___Shake_Away_Small_Critter_Repellent___Granules___20_oz__Container-P417.aspx - for the powdered version. Sprinkle on the ground along your fenceline.
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Simple, fishing line, nearly invisible, cheap and easy to install. Just need some sort of post on each corner of the fence, tie the line to that, and attach it to the opposite corner. Docks use this concept, and it is virtually 100 percent effect.
A nail is a good post, and not very noticeable, and you can paint it black or whatever color your fence is, to help it blend in.
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