Fox fence?

[duckfeathers]

The other day I was checking up on my new ducklings. I noticed something red in the yard... It was a fox cornering two of my older ducks. I got there in time to scare away the fox but it leaped over my 3.5 foot fence without any problems. I believe i will be seeing it more often. Does anybody know what type of cheap fence i can set up to prevent the fox? I also have coyote's in my area.
Thank you! Any ideas would help greatly!

 

[Oregon Blues]

I personally don't think you can protect poultry with cheap fence, but I suppose you could try electric mesh.