Finch feeders have holes which are usually designed smaller and narrower than universal bird feeders. These holes have a tendency to be vertical and thin. Finch feeding stations are generally filled up with thistle seed, which is a favorite of all outdoor finches. Finches are plentiful throughout North America so almost everywhere people are, finches can be found. Due to the fine nature of thistle, other feeders have been created which use finch feeder socks to hold the seed back which is another popular method of seed retention.