I always thought that a cat doesn’t really stand a chance to catch a healthy bird. I guess it depends on the kind of bird.
This one has a sensor adjustment. Birds will be just fine.
Heck, I remember having a DOG who would occasionally catch a bird. The result of a bird feeder which spilled seed on the ground underneath some evergreen trees with very low branches. The dog would trap the foraging bird underneath the tree where it couldn’t fly away.
You should try ice fishing. We had to rent a trailer to get it all home.
I ocassionally find the remains of goldfinches around our feeders. Our cat doesn’t even seem to be eating them, which would make me feel slightly better.
Yes. We feed feral cats and we feed the birds. We use ShakeAwayCat to keep the cats away from the bird feeding area. It’s expensive but a can will last a long a time and it is effective. http://http://www.lonepinestore.com/animalbirdrepellant.html
I knew an old Doper who swallowed a fly…
Hell, I know a doper who fucked a sheep (or so I’ve heard).
I know this is an old thread, but I found it odd that no one suggested putting collars with leetle dinky bells on the nice kitties. That way you don’t take away their fun, just handicap them a little bit. 
Sure, it won’t be easy to catch/collar them, but you’ll only need to trap 'em once.
My mom put a bell on the cat we had when I was growing up. She simply learned to walk in such a way as to not jingle the bell…
From the OP:
You know, when I tried it by the time I had a hole big enough to put the boat in, I was too tired to fish.
Birds of prey love a feeder out in the open.
Not in my (admittedly limited) experience: adult cats tend to prefer what they’re used to eating.
My experience is based on my own cats, who get plenty of cat food, and who enjoy chasing and catching birds, mice, etc. but haven’t shown any signs of interest in eating what they catch. (The fun thing is to bring critters inside, alive, to play with.) So a well-fed cat may still pose a threat to birds.
If you are feeding the birds well, they will prosper & their population will grow. So the few that are caught by the cats will not affect the population much.
Just let Darwinian nature take its course. You will be improving the over all quality of birds by letting the cats weed out the weaker and stupider ones.
Some birds are natural ground foragers, and taking advantage of an abundance of seed on the ground due to a human-controlled feeder does not make them weak or stupid to be picked off. They are simply easier targets, sadly.
To the OP…as **Thudlow **points out, cats will hunt even if well-fed. To avoid giving them easy pickings, get rid of the bird feeder.
You mean, besides the OP?
In 10 years, he’ll have a crop of super-intelligent birds that begin dive-bombing dwellings for food sources and/or idle fun.