what put in bird feeders to keep birds away?

Just put food & water in the bird house regularly for few weeks, sparrows will come defiantly.

Robin bird having a long beak.

Birds are definitely attracted more readily to certain seeds. For instance American Goldfinches love thistle and Northern Cardinals love sunflower seeds but many places sell assorted bags of seed that attract a broad variety of birds. Some birds also prefer feeding on the ground or flat surfaces ...

Feeding may not always bring a positive outcome for birds. In some cases, attractive feeders can become ecological traps, encouraging birds to settle in an area that cannot support them once supplemental feeding has stopped. Because of this, feeders create a population level that cannot be sustained ...