The slate-colored fox sparrow group comprises the Rocky Mountain taxa in the genus Passerella. It is currently classified as a "subspecies group" within the fox sparrows pending a more-thorough genetic assay of all forms.
Region
Western North America
Typical Environment
Breeds across the interior West, especially the Rocky Mountains, Great Basin ranges, and adjacent high plateaus from the interior of British Columbia and Alberta south through the United States to Utah, Nevada, Colorado, and northern Arizona and New Mexico. In winter it moves to lower elevations and latitudes across the southwestern United States and into northwestern Mexico. Typical breeding habitats include montane coniferous forest edges, willow–alder riparian thickets, aspen slopes, and brushy clearings. During migration and winter it favors chaparral, desert riparian corridors, and dense shrublands. It generally remains close to ground cover and patchy undergrowth.
Altitude Range
500–3200 m
Climate Zone
Highland
Ease of Keeping
Beginner friendly: 1/5
The slate-colored fox sparrow is the interior Rocky Mountain–Great Basin group within the Fox Sparrow complex, marked by slaty-gray upperparts and a contrasting rufous tail. Many authorities treat it as one of four recognizable groups pending full taxonomic resolution. It forages with a distinctive double-scratch in leaf litter and often stays low and hidden in dense shrubs. Hybrid zones occur with the thick-billed group where ranges meet.
Temperament
shy and skulking
Flight Pattern
short rapid wingbeats with low, direct dashes between cover
Social Behavior
Typically solitary or in pairs during breeding; forms loose flocks with other sparrows in winter. Nests are placed low in dense shrubs or on/near the ground, built from grasses and twigs. Pairs are monogamous for the season, and males sing from prominent perches near territories.
Migratory Pattern
Seasonal migrant
Song Description
A rich, loud, and musical series of clear whistled notes, often starting with a few sharp introductory phrases and then flowing into varied trills. Call notes include a sharp smack or chup given from dense cover.
Plumage
Clean, slaty-gray head and nape with gray-washed back, bright rufous wings and tail, and heavy dark chevron-shaped spots on a whitish breast coalescing into a central belly blotch.
Diet
Eats a mix of insects and other invertebrates, especially in the breeding season, along with seeds and small berries. Insects include beetles, caterpillars, and ants gleaned from leaf litter. Fruits such as elderberry and serviceberry are taken in late summer and fall, while grass and weed seeds make up more of the winter diet.
Preferred Environment
Forages on the ground under dense shrubs, in riparian thickets, and at forest edges with ample leaf litter. In winter it uses chaparral and brushy desert washes, often near water or in hedgerows.