White-Breasted Nuthatch

For the first time we notice the chestnut marbling under the tail.  It seems so out of character for this black/white bird.

Is it seasonal?

This overexposure shows a beautiful sunburst pattern.

The nuthatch walks up and down the trunks of oak, always headfirst.

It will visit a feeder. I've seen it take shelled sunflower and wedge it under the bark of an oak.