I have these tiny birds in back near my woods at the gate. They come down to the fence posts to eat where I put a seed mixture. They flock with the chickadees’. More tiny than a brown headed nuthatch. No black head. Dark grey head, maybe spot of color on back of neck. A flush of palest yellow beige on stomach. So tiny, almost no tail. Maybe just 4”. They squeak like a dogs squeaky toy. There are dozens of them. And they are hungry. We’ve been having 38, 42 temperatures even in early daytime. I can’t get a photo but they are pygmy nuthatch. I compared them to my National Geographic Field Guide.