Recommended
types of bird feed:
If you want to feed
only Cardinals, Doves and White-throated Sparrows, switch from black
oil sunflower to safflower. If you want only
Finches and an occasional Dove and White-throated Sparrow, try niger
thistle. Another way to discourage unwanted birds is to use
specialty feeders that for the most part, allow only "select"
birds to feed.
See
other Window Feeders for more bird feed recommendations.