This little Red-breasted Nuthatch female (male has darker cap and redder breast) has been coming to our feeder for hulled sunflower. She also takes it and feeds it to her fledglings. Definitely on the short list for cutest bird. Red-breasted Nuthatches make adorable, nasal, little "meep, meep" calls to keep in contact. They breed in northern parts of the country and the West, but can be found in much of the country in the non-breeding season.
This little female flew into our house accidentally, and hit a window as she tried to get out. She was stunned and we put her outside on the grass. Thankfully she recovered and was at the feeder today. Whew!