A very tiny chatterbox that visits my feeder is the Carolina Chickadee. These little birds are quite tiny, anywhere from two inches as an immature to four inches for adults. Being so tiny, you really need to look out for them. Not even their loud chirps will help spot them because they can hide easily behind the smallest of branches.
They love to swoop back and forth from the branhes to the feeder while chatting loudly. They are extremely fun to watch.