Ground feeder to exclude crows, magpies, etc?

Can anyone recommend a ground feeder (for seeds, mealworms, etc) which will exclude the larger birds like crows and magpies yet which will still allow blackbirds, robins, finches, wagtails, etc to get to the food?

 

Most ground feeders seem to be open to all birds, one idea is to have a small open tray and cover it with an upturned hanging basket over and peg it down.

 

Thanks, not a bad idea.

 

I made a cage (wood frame with Chicken wire)to go over the trays, but the magpie's will still get in if i'm not on garde dutes, magpie will be hard to stop has they can get in through the same gap has a black bird