Anyone know what kind of bird this is???

So this morning as we were finishing up with breakfast we had the pleasure of seeing these two little yellow birds playing/eating on our sunflowers! I knew there was reason why I've wanted sunflowers for several years! Fortunately the dogs were inside and my camera not far from the window! Tough taking pictures through our new windows, but this was able to be cropped to a decent picture! Enjoy...and if you know what it is let me know!