When you put out food for wildlife I always say that you have limited control over what comes next. That's why, as well as standard feeders there are reinforced one to restrict what gets the food. I have a Squirrel box with flap lid to feed the Red Squirrels, however, particularly when it is full, al sorts of visitors favour it such as Blackbird and Nuthatch. I believe that this is because the peanuts require no work and can be taken away to safety for consumption.
That said, I was getting confused about the seed feeder emptying so fast until today I found a visitor with a big appetite. A Roe Doe gingerly approached and took her fill of the seed, all the while taking glances in my direction. Clearly she neither saw nor, more surprisingly, smelt me. The Seed Thief unmasked. What a surprise!