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Genus Junco
Dark-eyed Junco - The Dark-eyed Junco, Junco hyemalis, is the best-known species of the juncos, a genus of small grayish American sparrows. This bird is common across much of temperate North America and in summer ranges far into the Arctic. It is a very variable species, much like the related Fox Sparrow , and its systematics is still not completely untangled.
Arizona junco - Its range is primarily in Mexico, extending into some of the mountains of the southern tips of the US.
Volcano Junco - This junco breeds above the timberline, typically at altitudes above 3000m, but there is an isolated population at 2100 m on the Caribbean slope of Costa Rica, and forest clearance on Cerro de la Muerte has allowed this species to descend to 2600 m. The habitat is open grassy or brushy areas with some stunted scrubs. The nest is a neat lined cup constructed on the ground under a log, bush or rock, or in a cavity on a vegetated bank. The female lays two brown-spotted pale blue eggs.