White-breasted Nuthatch

Nuthatches (around here almost always white-breasted, although you'll see a Red-breasted Nuthatch now and again) are smaller birds that forage for insects in and on tree bark. Their unmistakable nasally "pheent" is frequently heard, but they less often spotted.
Nuthatches are always on the hunt for insects on the trunks and branches of trees. In winter they'll eat seeds too, hiding any surplus seeds in the folds of tree bark to retrieve later. They've made a career of caching sunflower seeds out of our bird feeder all over the back yard.
One Nutatch I was watching this week had a particularly successful foray;

