Robins

Hi folks! I'm quite enthusiastic though not very experienced when it comes to garden birds but over the summer I've come up with a number of home-made feeders which the local sparrows just love. Sunflower hearts, mixed seed and recently "robin & small bird" seed.

Now, while I do get a robin or two in the garden they mainly feed on seed dropped by the sparrows and so far haven't taken anything from the feeders themselves.

Could it be that the sparrows are simply overpowering the robins with sheer numbers, or do robins prefer ground feeding?

If ground, how can I keep larger birds off the seed?

I had to resort to a cage to keep starlings off the mealworms & suet. Sparrows really enjoy those.

I also have some Niger seed but so far nothing has gone near it :(

Advice appreciated.