Also, its white cheek darkens to pale gray toward the nape, while the black-capped’s is completely white, with more white on its wing feathers. Nuthatch vs chickadee: Here’s how to tell the ...

The most widespread, numerous, and geographically variable chickadee, this bird brightens ... fading to pale buff by summer when worn; outer tail feathers edged prominently white.

Assessing the degree of hybridization between the two species Quantifying nest parasites along mountain slopes Characterizing the feather patterning of the two species. Theodosopoulos AN, Grabenstein ...

Finally, in the winter of 2018-2019, a new bird appeared with an extra patch of black on the left side of his face. There are only a couple of feathers involved in this particular departure from the ...