I had a problem with wild birds getting into the feed I had out for my free-ranging hens with chicks
just by luck, I came up with a partial solution -- I got several of those glass cookie jars that look like fishbowls turned partly on their sides
for some reason, the wild birds would not eat out of those -- maybe the reflections bothered them -- but the hens and chicks ate out of them with no problem (yes, the littlest chicks went right into the glass containers, but the hens clucked them out)
also kept the feed dry during moderate rain showers, and it was easy to see when they needed refilling
may depend on what sort of native birds you are dealing with --- these kept pigeons, mynahs, sparrows, cardinals, and thrushes out
(did help that the rooster was on patrol while the hens and chicks were feeding)
elevating the fishbowl/cookie jars so that hens can reach but the littlest birds cannot, might work even better