I say the same thing! "%$#*!", when they are at my feeders. Smart buggars know to tip one of them and pour seed all over the ground. Then there are millions of them!
Kari - this looks like a Mountain Chickadee. A Mountain Chickadee looks exactly like a Black Capped Chickadee except for the light stripe above the eye. They both have the same call "Chick - a -dee - dee -dee".
This fella is like a bowling ball. He barrels on into the feeding sending all the finches and sparrows flying away. Then the smaller birds hover near by sqwauking at him to beat it.