464. =Western flycatcher.= EMPIDONAX DIFFICILIS. Common summer resident; breeds from plains to 10,000 feet, but most common in upper part of its range.
466. =Traill's flycatcher.= EMPIDONAX TRAILLII. Fairly common summer resident; most common on the plains, but occurs in mountains up to 8,000 feet; breeds throughout its Colorado range.
467. =Least flycatcher.= EMPIDONAX MINIMUS. Rare migrant; west to eastern foothills; probably breeds, but no nests have been found.
468. =Hammond's flycatcher.= EMPIDONAX HAMMONDI. Common summer resident; comes east only to the western edge of the plains; breeds as high as 9,000 feet.
469. =Wright's flycatcher.= EMPIDONAX WRIGHTII. Abundant summer resident; breeds from 7,500 feet to 10,000.
474a. =Pallid horned lark.= OTOCORIS ALPESTRIS LEUCOLÆMA. Abundant winter resident; literature on this bird somewhat confused on account, no doubt, of its close resemblance to the next; winters on the plains abundantly, and sparsely in the mountains.
474c. =Desert horned lark.= OTOCORIS ALPESTRIS ARENICOLA. Abundant resident; winters on plains and in mountains up to 9,000 feet; breeds from plains to 13,000 feet; raises two broods.
475. =American magpie.= PICA PICA HUDSONICA. Common resident; breeds commonly on the plains and in the foothills and lower mountains; a few breed as high as 11,000 feet.
478b. =Long-crested jay.= CYANOCITTA STELLERI DIADEMATA. Common resident; seldom strays far east of the foothills; breeds from base of foothills to timber-line; winter range from edge of plains almost to 10,000 feet.
480. =Woodhouse's jay.= APHELOCOMA WOODHOUSEI. Common resident; most common along the base of foothills and lower wooded mountains; sometimes breeds as high as 8,000 feet; in fall roams up to 9,500 in special instances.
484a. =Rocky Mountain jay.= PERISOREUS CANADENSIS CAPITALIS. Common resident; remains near timber-line throughout the year.
486. =American raven.= CORVUS CORAX SINUATUS. Resident; common locally; breeds; rather of western Colorado, but visitant among eastern mountains.
487. =White-necked raven.= CORVUS CRYPTOLEUCUS. Rare resident now; formerly abundant along eastern base of the front range and a hundred miles out on the plains; now driven out by advent of white man.