One of my yard plans is to surround the bird feeder with thicket-y, prickly plants to create a bird-safe zone, thick and point enough to deter the cats.
To that end, last weekend I bought and planted a native rose. My supervisor takes her duties very seriously:

"Yes, I AM in charge of this hole. What do you want?"
After over-seeing the diggings, she double-checked for proper plant placement (by the way, get a load of those spines):

And then she showed what she thought of my 'thorny bushes deter cats' idea:

The spines add a nice bite to the flavor. Piquant!
Om nom nom.
To that end, last weekend I bought and planted a native rose. My supervisor takes her duties very seriously:

"Yes, I AM in charge of this hole. What do you want?"
After over-seeing the diggings, she double-checked for proper plant placement (by the way, get a load of those spines):

And then she showed what she thought of my 'thorny bushes deter cats' idea:

The spines add a nice bite to the flavor. Piquant!
Om nom nom.